“Youth is wasted on the young.”

You see things; and you say, 'Why?' But I dream things that never were; and I say, 'Why not?'

The reasonable man adapts himself to the world: the unreasonable one persists in trying to adapt the world to himself.

A life spent making mistakes is not only more honorable, but more useful than a life spent doing nothing.

Beware of false knowledge; it is more dangerous than ignorance.

The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.

There are two tragedies in life. One is to lose your heart's desire. The other is to gain it.