Every discovery contains an irrational element or a creative intuition.

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

Better our hypotheses die for our errors than ourselves.

We have become makers of our fate when we have ceased to pose as its prophets.

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.

It is easy to obtain confirmations, or verifications, for nearly every theory-if we look for confirmations. Confirmations should count only if they are the result of risky predictions... A theory which is not refutable by any conceivable event is non-scientific. Irrefutability is not a virtue of a theory (as people often think) but a vice. Every genuine test of a theory is an attempt to falsify it, or refute it.

Historically speaking all - or very nearly all - scientific theories originate from myths.