Never interrupt your enemy when he is making a mistake.

Doubt is not a pleasant condition, but certainty is absurd.

It's not the revolution that destroys machinery it's the friction.

You can discover what your enemy fears most by observing the means he uses to frighten you.

Against stupidity the gods themselves contend in vain.

A man may fail many times but he isn't a failure until he begins to blame somebody else.

Liberty means responsibility. That is why most men dread it.

Behind every great fortune there is a crime.

The most dangerous strategy is to jump a chasm in two leaps.