Al Kindi
Al Kindi
Al Kindi
Life
Al-Kindi (c. 185/801- c. 260/873) was the first Muslim philosopher. Philosophical studies in the
second/eighth century were in the hands of Christian Syriacs, who were primarily physicians.
They started, through encouragement by the Caliph, to translate Greek writings into Arabic.
Being the first Arab Muslim to study science and philosophy, al-Kindi was rightly called “the
Philosopher of the Arabs.”
His full name is: Abu Yusuf Ya`qub ibn Ishaq ibn al-Sabbah ibn `Imran ibn Isma`il ibn al-
Ash`ath ibn Qais al-Kindi. Kindah was one of the great Arab tribes before Islam. His grandfather
al-Ash`ath ibn Qais adopted Islam and was considered one of the Companions (Sahabah) of the
Prophet. Al-Ash`ath went with some of the pioneer Muslims to al-Kufah, where he and his
descendants lived. Ishaq ibn al-Sabbah, al-Kindi's father, was Governor of al-Kufah during the
reign of the `Abbasid Caliphs al-Mahdi and al-Rashid. Most probably al-Kindi was born in the
year 185/801,1 a decade before the death of al-Rashid.
Al-Kufah and al-Basrah, in the second/eighth and third/ninth centuries, were the two rivalling
centres of Islamic culture. Al-Kufah was more inclined to rational studies; and in this intellectual
atmosphere, al-Kindi passed his early boyhood. He learnt the Qur'an by heart, the Arabic
grammar, literature, and elementary arithmetic, all of which formed the curriculum for all
Muslim children. He, then, studied Fiqh and the new-born discipline called Kalam. But it seems
that he was more interested in sciences and philosophy, to which he consecrated the rest of his
life, especially after he went to Baghdad.
A complete knowledge of Greek science and philosophy required proficiency in Greek and
Syriac languages into which latter many Greek works had already been translated. It seems that
al-Kindi learnt Greek, but certainly he mastered the Syriac language from which he translated
several works. He also revised some of the Arabic translations, such as al-Himsi's translation of
Plotinus'Enneads, which passed to the Arabs as one of the writings of Aristotle. Al-Qifti, the
biographer, says that “al-Kindi translated many philosophical books, clarified their difficulties,
and summarized their deep theories.”2
In Baghdad he was connected with al-Ma'mun, al-Mu'tasim, and the latter's son Ahmad. He was
nominated tutor of Ahmad ibn al-Mu'tasim, to whom he dedicated some of his important
writings. Ibn Nabatah says: “Al-Kindi and his writings embellished the empire of al-
Mu`tasim.”3 He flourished also under the reign of al-Mutawakkil (r. 232-247/847-861). A story
related by Ibn Abi Usaibi'ah indicates the great fame of al-Kindi at that time, his advanced
knowledge, and his famous private library.
This is the full account: “Muhammad and Ahmad, the sons of Musa ibn Shakir, who lived during
the reign of al-Mutawakkil, were conspiring against everyone who was advanced in knowledge.
They sent a certain Sanad ibn 'Ali to Baghdad so that he might get al-Kindi away from al-
Mutawakkil. Their conspiracies succeeded to the point that al-Mutawakkil ordered al-Kindi to be
beaten. His whole library was confiscated and put in a separate place, labelled as the 'Kindian
Library.”4'
Al-Kindi's notoriety for avarice was equal to his fame for knowledge. This bad repute was due to
al-Jahiz's caricature of him in his Kitab al-Bukhala'. However, al-Kindi lived a luxurious life in a
house, in the garden of which he bred many curious animals. It seems that he lived aloof from
society, even from his neighbours.
An interesting story related by al-Qifti shows that al-Kindi lived in the neighborhood of a
wealthy merchant, who never knew that al-Kindi was an excellent physician. Once the
merchant's son was attacked by sudden paralysis and no physician in Baghdad was able to cure
him. Someone told the merchant that he lived in the neighborhood of the most brilliant
philosopher, who was very clever in curing that particular illness. Al-Kindi cured the paralyzed
boy by music.
Works
Most of his numerous works (numbering about 270) are lost. Ibn al-Nadim and following him al-
Qifti classified his writings, most of which are short treatises, into seventeen groups: (1)
philosophical, (2) logical, (3) arithmetical, (4) globular, (5) musical, (6) astronomical, (7)
geometrical, (8) spherical, (9), medical, (10) astrological, (11) dialectical, (12) psychological,
(13) political, (14) causal (meteorological), (15) dimensional, (16) on first things, (17) on the
species of some metals, chemicals, etc.
This account shows to what extent al-Kindi's knowledge was encyclopedic. Some of his
scientific works were translated by Gerard of Cremona into Latin and influenced very much the
thought of medieval Europe. Cardano considered him to be one of the twelve greatest minds.
Scholars studied al-Kindi, until his Arabic treatises were discovered and edited, merely on the
basis of the extant Latin translations. His De Medicinarum Compositarum Gradibus was
published in 938/1531. Albino Nagy5 in 1315/1897 edited the medieval translations of these
treatises: De intellectu; De Somno et visione; De quinque essentiis; Liber introductorius in artem
logicae demonstrationis.
Since the discovery of some of his Arabic manuscripts, a new light has been thrown on al-Kindi's
philosophy. A compendium containing about 25 treatises was found by Ritter in Istanbul. Now
they have all been edited by different scholars, Walzer, Rosenthal, Abu Ridah, and Ahmed
Fouad El-Ehwany.6 There are other short treatises discovered in Aleppo, but they have not yet
been edited. It has become possible, to a certain extent, to analyse al-Kindi's philosophy on more
or less sure grounds.
Philosophy
It was due to al-Kindi that philosophy came to be acknowledged as a part of Islamic culture. The
early Arab historians called him “the Philosopher of the Arabs” for this reason. It is true that he
borrowed his ideas from Neo-Platonic Aristotelianism, but it is also true that he put those ideas
in a new context. By conciliating Hellenistic heritage with Islam he laid the foundations of a new
philosophy. Indeed, this conciliation remained for a long time the chief feature of this
philosophy. Furthermore, al-Kindi, specializing in all the sciences known at his time - of which
his writings give sufficient evidence - made philosophy a comprehensive study embracing all
sciences.
Al-Farabi, Ibn Sina, and Ibn Rushd were first scientists and then philosophers. For this reason
Ibn al-Nadim placed al-Kindi in the class of natural philosophers. This is his full account: “Al-
Kindi is the best man of his time, unique in his knowledge of all the ancient sciences. He is
called the Philosopher of the Arabs. His books deal with different sciences, such as logic,
philosophy, geometry, arithmetic, astronomy, etc. We have connected him with the natural
philosophers because of his prominence in science.”7
Philosophy is the knowledge of truth. Muslim philosophers, like the Greek, believed that truth is
something over and above experience; that it lies immutable and eternal in a supernatural world.
The definition of philosophy in al-Kindi's treatise on “First Philosophy” runs like this:
“Philosophy is the knowledge of the reality of things within man's possibility, because the
philosopher's end in his theoretical knowledge is to gain truth and in his practical knowledge to
behave in accordance with truth.”
At the end of the treatise, God is qualified by the term “truth,” which is the objective of philo-
sophy. “The True One (al-Wahid al-Haq) is, then, the First, the Creator, the Sustainer of all that
He has created. ...” This view is borrowed from Aristotle's metaphysics, but the Unmovable
Mover of Aristotle is substituted by the Creator. This difference constitutes the core of the
Kindian system.
Philosophy is classified into two main divisions: theoretical studies, which are physics,
mathematics, and metaphysics; and practical studies which are ethics, economics, and politics. A
later writer, quoting al-Kindi, gives the classification as follows: “Theory and practice are the
beginning of the virtues. Each one of the two is divided into the physical, mathematical, and
theological parts. Practice is divided into the guidance of one's self, that of one's house, and that
of one's city.” 8
Ibn Nabata, quoting also al-Kindi, mentions only the theoretical divisions. “The philosophical
sciences are of three kinds: the first in teaching (ta`lim) is mathematics which is intermediate in
nature; the second is physics, which is the last in nature; the third is theology which is the highest
in nature.”9 The priority of mathematics goes back to Aristotle, but the final sequence of the
three sciences beginning with physics came from the later Peripatetics. Most probably al-Kindi
was following Ptolemy, who gave a division of sciences in the beginning
of Almagest.10 Mathematics was known to the Arabs from that time on as the “first study.”
The definition of philosophy and its classification, as mentioned above, remained traditional in
Muslim philosophy. As Mustafa 'Abd al-Raziq puts it: “This attitude in understanding the
meaning of philosophy and its classification according to subject-matter directed Muslim
philosophy from its very outset.”11
First philosophy or metaphysics is the knowledge of the First Cause, because all the rest of
philosophy is included in this knowledge.12 The method followed in the study of first
philosophy is the logic of demonstration. From now on, logic will be the instrument of the
philosophers in their quest for truth.
Al-Kindi's value as a philosopher was debated in ancient times because of the lack of logical
theory in his system. Sa'id al-Andalusi says: “Al-Kindi wrote on logic many books which never
became popular, and which people never read or used in the sciences, because these books
missed the art of analysis which is the only way to distinguish between right and wrong in every
study. By the art of synthesis, which is what Ya`qub meant by his writings, no one can profit,
unless he has sure premises from which he can make the synthesis.”
It is difficult for us to give an exact idea concerning this charge until his logical treatises are
discovered. But the fact that al-Farabi was called the “Second Master” because of his introducing
logic as the method of thinking in Islamic philosophy13 seems to corroborate the judgment of
Sa'id just mentioned.
God
An adequate and sure knowledge of God is the final objective of philosophy. Philosophy by its
very name was a Greek study. For this. reason, al-Kindi made a great effort to transmit Greek
philosophy to the Arabs. As Rosenthal rightly puts it: “Al-Kindi himself states that he considered
it his task to serve as an Arab transmitter and interpreter of the ancient heritage.”21 In Theon's
commentary on the Almagest of Ptolemy, we find God described as immutable, simple, of
invisible nature, and the true cause of motion.
Al-Kindi in his treatise al-Sina'at al-'Uzma 22 paraphrases the same idea. He says: “For God,
great is His praise, is the reason and agent of this motion, being eternal (qadim), He cannot be
seen and does not move, but in fact causes motion without. moving Himself. This is His
description for those who understand Him in plain words: He is simple in that He cannot be
dissolved into something simpler; and He is indivisible because He is not composed and
composition has no hold on Him, but in fact He is separate from the visible bodies, since He ... is
the reason of the motion of the visible bodies.”23
Simplicity, indivisibility, invisibility, and causality of motion are the divine attributes stated by
Theon. When al-Kindi mentions them he is simply a transmitter of the Hellenistic conception of
God. The originality of al-Kindi lies in his conciliation of the Islamic concept of God with the
philosophical ideas which were current in the later Neo-Platonism.
The basic Islamic notions concerning God are His unicity, His act of creation from nothing, and
the dependence of all creatures on Him. These attributes are stated in the Qur'an in a manner
which is neither philosophical nor dialectical. Al-Kindi qualifies God in new terms. God is the
true one. He is transcendent and can be qualified only by negative attributes. “He has no matter,
no form, no quantity, no quality, no relation; nor is He qualified by any of the remaining
categories (al-maqulat).24 He has no genus, no differentia, no species, no proprium, no accident.
He is immutable.... He is, therefore, absolute oneness, nothing but oneness (wahdah). Everything
else is multiple.”25
To understand the position of al-Kindi, we must refer to the Traditionalists and the Mu'tazilites.
The Traditionalists - Ibn Hanbal was one of their chief representatives - refused to interpret the
attributes of God. They simply called them “the names of God.” When, for example, Ibn Hanbal
was asked whether the Qur'an, being the Word of God, is eternal (qadim) or created (makhluq),
he gave no answer. His only answer was that the Qur'an is the Word (kalam) of God. The
Traditionalists accepted the literal meaning of the Scripture, i. e. without any further
interpretation.
The Mu'tazilites, such as were the contemporaries of al-Kindi, rationally interpreted the attributes
of God to establish His absolute unicity. They solved the problem on the basis of the relation
between the essence (dhat) of God and His attributes (sifat). The main attributes in their view
amount to three: knowledge, power, and will. These they negate, for, if affirmed of God, they
would entail plurality in His essence. The Mu'tazilites and the philosophers shared this denial of
the divine attributes. Al-Ghazali rightly says in the Tahafut al-Falasifah that “the philosophers
agree exactly as do the Mu'tazilites that it is impossible to ascribe to the First Principle
knowledge, power, and will.”26
Al-Kindi, the first philosopher in Islam, followed the Mu'tazilites in their denial of the attributes.
But his approach to the solution of the problem is quite different. First, it is not the essence of
God and His attributes with which he is concerned; it is rather the predicability of the categories
- as we have seen above - to the substance of God. Secondly, all things can be defined, hence
known, by giving their genera and differentiae, except God who has neither genus nor
differentia. In other terms, al-Kindi follows in his quest the “way of the logicians.”
The Kindian arguments for the existence of God depend on the belief in causality. Everything
that comes to be must have a cause for its existence. The series of causes are finite, and
consequently there is a prime cause, or the true cause, which is God. Causes, enumerated by
Aristotle, are the material, the formal, the efficient, and the final. In al-Kindi's philosophy, as
repeated in many of his treatises, God is the efficient cause.
There are two kinds of efficient causes; the first is the true efficient cause and its action is
creation from nothing (ibda'). All the other efficient causes are intermediate, i.e., they are
produced by other causes, and are themselves the causes of other effects. They are called so by
analogy; in fact, they are not true causes at all. Only God is the true efficient cause. He acts and
is never acted upon.
Given that the world is created by the action of ibda' in no time, it must be in need of a creator,
i.e., God. Nothing which is created is eternal; God alone is eternal. Beings come to be and pass
away. This is clear in the case of corporeal sensibles which are in perpetual flux and change.
Also the world as a whole, the celestial bodies, and the universals, such as genera and species,
are not eternal, because they are finite and composed. Everything which is finite in space and
time is not eternal. The notion of infinity occupies an important place in the philosophy of al-
Kindi, and will be discussed later in detail.
Another proof for the existence of God is the order observed in all natural beings. The regularity
inherent in the world, the hierarchical degrees of its parts, their interactions, the most perfect
state in every being realizing its highest goodness - all this is a proof that there is a Perfect Being
who manages everything according to the greatest wisdom 27
Beings are in continuous need of God. This is so because God, the Creator ex nihilo, is the
sustainer of all that He has created, so that if anything lacks His sustainment and power, it
perishes.28
Infinity
The world in Aristotle's system is finite in space but infinite in time, because the movement of
the world is co-eternal with the Unmovable Mover. Eternity of the world was refuted in Islamic
thought, since Islam holds that the world is created. Muslim philosophers, facing this problem,
tried to find a solution in accord with religion. Ibn Sina, and Ibn Rushd were accused of atheism
because of their pro-Aristotelianism; they assumed that the world is eternal. In fact, this problem
remained one of the important features of Islamic philosophy, and al-Ghazali mentioned it at the
beginning of his twenty points against the philosophers in the Tahafut al-Falasifah.
Al-Kindi, contrary to his great successors, maintained that the world is not eternal. Of this
problem he gave a radical solution by discussing the notion of infinity on mathematical grounds.
Physical bodies are composed of matter and form, and move in space and time. Matter, form,
space, movement, and time are the five substances in every physical body. (Res autem quae sunt
in omnibus substantiis sunt quinque, quarum una est hyle, et secunda est forma, et tertia est
locus, et quarta est motes, et quinta est tempus.) 29
Being so connected with corporeal bodies, time and space are finite, given that corporeal bodies
are finite; and these latter are finite because they cannot exist except within limits.
Time is not movement; it is the number which measures the motion (Tempus ergo est numerus
numerans motum) for it is nothing other than the prior and posterior. Number is of two kinds:
discrete and continuous. Time is not of the discrete kind but of the continuous kind. Hence, time
is definable as the supposed instants which continue from the past to the future. In other words,
time is the sum of anterior and posterior instants. It is the continuum of instants.
Time is part of the knowledge of quantity. Space, movement, and time are quantities. The
knowledge of these three substances and also the other two is subordinate to the knowledge of
quantity and quality. As mentioned above, he who lacks the knowledge of quantity and quality
will lack knowledge of the primary and secondary substances. Quality is the capacity of being
similar and dissimilar; quantity, of being equal and unequal. Hence, the three notions of equality,
greater, and less are basic in demonstrating the concepts of finitude and infinity.
The arguments against infinity are repeated in a number of al-Kindi's treatises. We give from his
treatise “On the Finitude of the Body of the World” the four theorems given as proofs for
finitude: -
(1) Two magnitudes30 of the same kind are called equal if one is not greater than the other.31
(2) If a magnitude of the same kind is added to one of the two magnitudes of the kind, they will
be unequal.
(3) Two magnitudes of the kind cannot be infinite, if one is less than the other, because the less
measures the greater or a part of it.
(4) The sum of two magnitudes of the kind, each of which is finite, is finite.
Given these axioms, every body, being composed of matter and form, limited in space, and
moving in time, is finite, even if it is the body of the world. And, being finite it is not eternal.
God alone is eternal.
Bibliography
Mustafa `Abd al-Raziq, Failasuf al-'Arab w-al-Mu'allim al-Thani, Cairo, 1945;
Ahmed Fouad El-Ehwany, “Al-Kindi, Treatise on First Philosophy,” Cairo, 1948;Islamic
Philosophy, Cairo, 1957;
Abu Ridah, Rasa'il al-Kindi, Cairo, 2 Vols., 1950, 1953;
Al-Qifti, Tarikh al-Hukama.', Cairo;
Ibn Nabatah, Sharh Risalah Ibn Zaidun, Cairo;
Ibn Abi Usaibi'ah, Tabaqat al-Atibba', Cairo;
Madkour, La Place d'Al-Farabi dans l'Ecole Philosophique Musulmane;
G. Furlani, “Una risala di Al-Kindi sull'anima,” Rivista trimestrale di Studi Filosofici e Religiosi,
Vol. III, 1922;
M. Guidi and R. Walzer, “Studi su al-Kindi, 1. Uno scritto introduttivo allo studio di
Aristotele,” Memorie R.. Accademia dei Lincei, ser. 2, Vol. IV, fasc. 5, Roma, 1940; “Studi su
Al-Kindi, 2. Uno scritto morale inedito di Al-Kindi,” ibid., ser. 6, Vol. VIII, fasc. I, Roma, 1938;
L. Gauthier, Antecedents Grieo-Arabes de la Psychophysique (Al Kindi De rerum gradibus),
Beyrouth, 1939; Die philosophischen Abhandlungen des al-Kindi, first published by von Albino
Nagy, Beitr. zur Gesch. d. Philos. des Mittelalters, Vol. II, Munster, 1897. This contains the
following medieval translations (some at least by Gerard of Cremona): De intellectu; De somno
et uisione; De quinque essentiis; Liber introductorius in arten logicae demonstrationis; and also
a study of the original texts and the translations and elaborate notes;
G. Flugel, Al-Kindi genannt “der Philosoph der Araber,” Abhdl. f. die Kunde des
Morgenlandes, Leipzig, 1857.
1. Mustafa 'Abd al-Raziq, following de Boer, gives this date. On the biography of al-
Kindi the best article is that of Mustafa 'Abd al-Raziq in Failasuf al-`Arab w-al-
Mu`allim al-Thani, Cairo, 1945, pp. 7-50. See also Ahmed Fouad El-Ehwany's
“Introduction” to the edition of al-Kindi's treatise on “First Philosophy,” Cairo, 1948,
pp. 3-49, and Abu Ridah's “Introduction” to Rasa'il al-Kindi, Cairo, 1950, pp. 1-80.
2. Al-Qifti, Tarikh al-Hukama', Cairo ed., p. 241
3. Ibn Nabatah, Sharh Risalah Ibn Zaidun, Cairo, p. 113.
4. Ibn Abi Usaibi'ah, Tabaqat al-Atibba', Cairo, Vol. I, p. 207.
5. Albino Nagy, Die philosophischen Abhandlungen des al-Kindi, 1897
6. Ahmed Fouad El-Ehwany edited his important and long treatise on “First
Philosophy” in 1948; his De Intellectu with Kitab al-Nafs of Ibn Rushd in 1950; his
treatise “On the Soul” in al-Kitab, 1949. Abu Ridah edited all the treatises in two
volumes in Cairo, the first in 1950, the second in 1953. M. Guidi and R. Walzer edited
in 1940 his treatise “On the Number of Aristotle's Books,” and translated it into the
Italian, in Real Academia Nazionale dei Lincei, ser. VI, Vol. VI, fasc. 5. Rosenthal in
1956 edited in the Journal of the American Oriental Society, Vol. LXXVI, No. 1, pp.
27-31, his treatise “On Atmospheric Phenomena” (Risalah fi Ahdath al-Jaww).
7. Ibn Nadim, al-Fihrist, Cairo, p.255.
8. Rosenthal, op.cit, p.27.
9. Ibn Nabatah, op. cit., p. 125
10. A full discussion of this question is found in the article of Rosenthal referred to
above.
11. Mustafa 'Abd al-Raziq, op. cit., p. 47.
12. El-Ehwany. Ed..”First Philosophy,” Cairo, 1948, p. 79
13. El-Ehwany, Islamic Philosophy, Cairo, 1957, pp. 35-36
14. Mustafa 'Abd al-Raziq, op. cit., p. 47
15. “First Philosophy,” p. 82.
16. Ibid.
17. Ibid.
18. In Oriens, Vol. X, No. 2, 1957, “New Studies on al-Kindi,” Walzer translates this
term by “divine knowledge.” We guess what is meant in this context is the divine
science as compared with human science. Guidi and Walzer edited this manuscript and
translated it into Italian: Il Numero dei Libri di Aristotle. In the Italian translation the
term is scienza divina which corresponds to divine science.
19. “This” either refers to the divine science, the divine knowledge of the prophet, or
the prophetic faculty. Walzer in his translation of this passage gives the latter
interpretation. Cf. Oriens, p. 206.
20. M. Guidi and R. Walzer, op. cit., p. 395. Except at some places, we follow in the
main the translation given by Walzer in Oriens, p. 206.
21. Rosenthal, “Al-Kindi and Ptolemy,” Studi Orientalistsci, Vol. II, Roma, 1956, p.
455. The view that al-Kindi was not a true philosopher, but simply a translator, was
held by some ancient writers. Madkour, in his book La Place d'Al-Farabii dans l'Ecole
Philosophique Musulmane, considers him rather a mathematician. Abu Ridah, in his
“Introduction” to al-Rasa'il, considers him to be a true philosopher in the full sense of
the term. We rather adhere to Rosenthal's view. Cf. Ahmed Fouad El-Ehwany's
“Introduction” to al-Kindi's “First Philosophy.”
22. This treatise is not yet edited.. Rosenthal, in the above article on “Al-Kindi and
Ptolemy,” gave some excerpts and analysed it.
23. Rosenthal, “Al.Kindi and Ptolemy,” Studi Orientalistici, p. 449. The author has
compared Ptolemy's text with both Theon's commentary and al-Kindi's text
24. With Abu Ridah we understand this term to be intelligibles or concepts (al-
ma'qulat), but categories is more suitable in this .context.
25. “First Philosophy,” p. 141; in Abu Ridah's edition, p. 160. The term wahdah means
either unity or oneness, but in this context it is oneness.
26. Van den Bergh, The Incoherence of the Incoherence, London, 1954, Vol. I, p. 186.
27. Abu Ridah, Rasa'il, “On the Efficient Cause of Generation and Corruption,” p. 215.
28. “First Philosophy”, p.143.
29. Liber de Quinque Essentiis. This treatise was translated into Latin in the Medieval
Ages.
30. Magnitudes apply to lines, surfaces, or bodies. A magnitude of the same kind means
one applying solely to one of the three kinds mentioned. Cf. Abu Ridah, Rasa'il, Vol. I,
“Treatise on the Finitude of the Body of the World,” p. 187.
31. We quote the example given by al-Kindi and the proof of this theorem as a
specimen of his mathematical method. “Example: Given A and B are magnitudes of the
same kind, and the one is
not greater than the other, we say that they are equal. Proof: If they are unequal, then
one is greater than the other, say A is greater than B. But since A is not greater than B,
as mentioned above, this leads to a contradiction. It follows that they are equal.” Ibid.,
p. 188.
32. El-Ehwany, Islamic Philosophy, Cairo, 1951, pp. 51-52
33. “First Philosophy.” p. 134
34. The term wahdah means here oneness, not unity. At the beginning of this same
paragraph he speaks about “the true one,” and says it is not soul.
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