Neither our greatest fears nor our greatest hopes are beyond the limits of our strength— we are able in the end both to dominate the first and to achieve the second.
It is the possession of a body that is the great danger to the mind.
Any human altruism which is without egotism is sterile.
I knew that my brain was like a basin of rock rich in minerals, in which lay vast and varied ores of great price. But should I have time to exploit them?