He acknowledges the three "slices of the pie of life". The first two
slices being the two smallest pieces - i.e., the stuff that you know
you know, and the stuff you know you don't know. The third slice of
that pie (85% - 95%)is the stuff you don't even know you don't know.
Takes pride in the fact that he makes life decisions based on
decreasing that piece of the pie of the stuff he didn't even know he
didn't know.