The teacher is one who makes two ideas grow where only one grew before.

A friend is someone who knows all about you and still loves you.

Positive anything is better than negative nothing.

Do not take life too seriously. You will never get out of it alive.

The friend is the man who knows all about you, and still likes you.

The greatest mistake you can make in life is continually fearing that you'll make one.

Love grows by giving. The love we give away is the only love we keep. The only way to retain love is to give it away.

Never explain - your friends do not need it and your enemies will not believe you anyway.

The best preparation for good work tomorrow is to do good work today.

To avoid criticism, do nothing, say nothing and be nothing.

One machine can do the work of fifty ordinary men. No machine can do the work of one extraordinary man.

There are endless opportunities in life.

Spam is a waste of the receivers’ time, and, a waste of the sender’s optimism.

Gaza is going to test who believes in the worth of human beings.

Evolution by natural selection is not an idle hypothesis. The genetic variation on which selection acts is well understood in principle all the way down to the molecular level.

This is your moment. You're meant to be here.

Fortune, delighting in her cruel task, and playing her wanton game untiringly, is ever shifting her uncertain favours.

Only by providing leading-edge human capital and knowledge capital can American continue to maintain a high standard of living, including providing national security for its citizens.

Criticism is concerned with evaluation. There may be evaluative principles implicit in this or that form of theory, but theory in and of itself is not prescriptive.

The good thing is that I have always had wonderful people around me. It's dangerous when you start earning a lot of money and you become famous when you are too young.

Only when you stop doing what doesn't work, can things get better.