Isolation always perverts; when a man lives only among his own sort, he soon begins to believe that his sort are the best sort. This attitude breeds both the arrogance of the conservative and the bitterness of the radical.

The time to relax is when you don't have time for it.

Ninety percent of what we believe has nothing to do with the process of thought, but comes instead from the four sources of family inheritance, individual temperament, national culture, and economic self-interest; and while we cannot wholly cast off these shackles, we should at least recognize their cramping and distorting influence upon the free process of thought.