Failing isn't bad when you learn what not to do.

What counts can't always be counted; what can be counted doesn't always count.

Arrows of hate have been aimed at me too, but they have never hit me, because somehow they belonged to another world with which I have no connection whatsoever.

Almost all the other fellows do not look from the facts to the theory but from the theory to the facts; they cannot get out of the network of already accepted concepts; instead, comically, they only wriggle about inside.

Insanity: doing the same thing over and over again and expecting different results.

Curiosity is a delicate little plant that, aside from stimulation, stands mainly in need of freedom.

Life is like riding a bicycle. To keep your balance, you must keep moving.