Only in thought is man a God; in action and desire we are the slaves of circumstance.

None but a coward dares to boast that he has never known fear.

Every great idea starts out as a blasphemy.

Plato has dramatic strength ... but is quite unaware of the strength of the argument against his position ... and allows himself to be grossly unfair in arguing against it.

One of the main causes of trouble in the world is dogmatic and fanatical belief in some doctrine for which there is no adequate evidence

Calculating machines do sums better than even the cleverest people… As arithmetic has grown easier, it has come to be less respected.

Drunkeness is temporary suicide: the happiness that it brings is merely negative, a momentary cessation of unhappiness.