The danger of the past was that men became slaves. The danger of the future is that men may become robots.

Genius is one per cent inspiration, ninety-nine per cent perspiration.

I race to win. If I am on the bike or in a car it will always be the same.

A proof of a proposition is a process the nature of which is such as to produce in us a belief in that proposition.

The only thing we have to fear is fear itself.

不存在能力、天赋、气质、心理素质和特征的遗传。