My own belief is that in most ages and in most places obscure psychological forces led men to adopt systems involving quite unnecessary cruelty, and that this is still the case among the most civilized races at the present day.

The newspapers at one time said that I was dead but after carefully examining the evidence I came to the conclusion that this statement was false.

Science does not aim at establishing immutable truths and eternal dogmas; its aim is to approach the truth by successive approximations, without claiming that at any stage final and complete accuracy has been achieved.

The observer, when he seems to himself to be observing a stone, is really, if physics is to be believed, observing the effects of the stone upon himself.

Love is a slippery eel that bites like hell

The scientific attitude of mind involves a sweeping away of all other desires in the interest of the desire to know.

The true spirit of delight...is to be found in mathematics as surely as in poetry.