Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

What is necessary to change a person is to change his awareness of himself.

If everything isn't black and white, I say, 'Why the hell not?'

A stale article, if you dip it in a good, warm, sunny smile, will go off better than a fresh one that you've scowled upon.

Enthusiasm... the sustaining power of all great action.

There is a real magic in enthusiasm. It spells the difference between mediocrity and accomplishment

There are two things children should get from their parents: roots and wings.

Any product that needs a manual to work is broken.

Don't take the wrong side of an argument just because your opponent has taken the right side.

All human actions have one or more of these seven causes: chance, nature, compulsion, habit, reason, passion, and desire.

A great city is the place to escape the true drama of provincial life, and find solace in fantasy.

Light thinks it travels faster than anything but it is wrong. No matter how fast light travels, it finds the darkness has always got there first, and is waiting for it.

All is disgust when a man leaves his own nature and does what is unfit.

All battles are fought by scared men who'd rather be some place else.

We often discover what will do by finding out what will not do; and probably he who never made a mistake never made a discovery.

Humility is attentive patience.

When you get to a certain age, there is no coming back.

Be less curious about people and more curious about ideas.

We do not have to visit a madhouse to find disordered minds; our planet is the mental institution of the universe.

Be that self which one truly is.

Jests that give pains are not jests.