Culture in its higher forms is a delicate plant which depends on a complicated set of conditions and is wont to flourish only in a few places at any given time.

When a man is sufficiently motivated, discipline will take care of itself.

If people are good because they fear punishment, and hope for reward, then we are a sorry lot indeed.

Real sign of intelligence isn't knoweldge, it's imagination

The pursuit of knowledge is more valuable than its possession.

I believe my theory of relativity to be true. But it will only be proved for certain in 1981, when I am dead.

It is a very grave mistake to think that the enjoyment of seeing and searching can be promoted by means of coercion and a sense of duty. To the contrary, I believe it would be possible to rob even a healthy beast of prey of its voraciousness, if it were possible, with the aid of a whip, to force the beast to devour continuously, even when not hungry.