If you know that things are bound to happen whatever you do, then you may feel free to give up the fight against them.

You cannot have a rational discussion with a man who prefers shooting you to being convinced by you.

The initial stage, the act of conceiving or inventing a theory, seems to me neither to call for logical analysis nor to be susceptible of it.

Science may be described as the art of systematic over-simplification.

I have spoken to Einstein and he admitted to me that his theory was in fact no different from the one of Parmenides.

Rationalism is an attitude of readiness to listen to contrary arguments and to learn from experience... of admitting that "I may be wrong and you may be right and, by an effort, we may get nearer the truth."

Whenever a theory appears to you as the only possible one, take this as a sign that you have neither understood the theory nor the problem which it was intended to solve.