When a Caltech student asked the eminent cosmologist Michael Turner what his "bias" was in favoring one or another particle as a likely candidate to compromise dark matter in the universe, Feynmann snapped, "Why do you want to know his bias? Form your own bias!"

We can deduce, often, from one part of physics like the law of gravitation, a principle which turns out to be much more valid than the derivation.

There is one simplification at least. Electrons behave ... in exactly the same way as photons; they are both screwy, but in exactly in the same way.

To decide upon the answer is not scientific. In order to make progress, one must leave the door to the unknown ajar ajar only.

The first principle is that you must not fool yourself and you are the easiest person to fool.

Science is the belief in the ignorance of experts.

It is simple, therefore it is beautiful