Knowledge talks, wisdom listens.

Fool me once, shame on you. Fool me twice, shame on me !

Only the wisest and the stupidest of men never change.

Don’t let your victories go to your head, or your failures go to your heart.

Those who criticize our generation forget who raised it.

Criticizing is easy, art is difficult.

Violence won’t solve a thing. It makes it more challenging to solve, though.

I don’t know what the key to success is, but the key to failure is trying to please everyone.

When the character of a man is not clear to you, look at his friends.

Not to care for philosophy is to be a true philospher.

The mind is like a parachute. It doesn’t work unless it’s open.

The best mind-altering drug is truth.

Be wiser than other people if you can, but do not tell them so.

Never forget what a man says to you when he is angry.

A winner listens, a loser just waits until it is their turn to talk.

Guns don’t kill people — people do.

He who knows others is wise. He who knows himself is enlightened.

If you are not part of the cure, then you are part of the problem.

The only time you run out of chances is when you stop taking them.

The best things in life are not things.

An investment in knowledge always pays the best interest.

You can tell more about a person by what he says about others than you can by what others say about him.

Think like a man of action, and act like a man of thought.

Beware of a man of one book.

He who knows others is learned; he who knows himself is wise.