To create a healthy philosophy you should renounce metaphysics but be a good mathematician.

One of the symptoms of an approaching nervous breakdown is the belief that one's work is terribly important.

Science is no substitute for virtue; the heart is as necessary for a good life as the head.

Bad philosophers may have a certain influence; good philosophers, never.

Indignation is a submission of our thoughts, but not of our desires.

The very best proof that something can be done is that someone has already done it.

Thought is subversive and revolutionary, destructive and terrible, Thought is merciless to privilege, established institutions, and comfortable habit. Thought is great and swift and free.