My definition of a free society is a society where it is safe to be unpopular.
If you want a friend, get a dog.
A dozen, a gross, and a score... Plus three times the square-root of four... Divided by seven... Plus five times eleven... Is nine squared and not a bit more.
Man is born to live, not to prepare for life.
The four most beautiful words in our common language: I told you so.
There are no hopeless situations; there are only people who have grown hopeless about them.
When you make your peace with authority, you become authority.
It's all right to have a train of thoughts, if you have a terminal.
If we like a man's dream, we call him a reformer; if we don't like his dream, we call him a crank.
The way to do research is to attack the facts at the point of greatest astonishment.