Classical thermodynamics ... is the only physical theory of universal content which I am convinced ... will never be overthrown.

Gravitation is not responsible for people falling in love.

Life is like riding a bicycle. To keep your balance, you must keep moving.

Life isn't worth living, unless it is lived for someone else.

Imagination is everything. It is the preview of life's coming attractions.

Wisdom is not a product of schooling but of the lifelong attempt to acquire it.

Strive not to be a success, but rather to be of value.

The true sign of intelligence is not knowledge but imagination.

God is clever but not dishonest.

Try not to become a man of success but rather a man of value.

Weakness of attitude becomes weakness of character.

Societies that have condoned male cheating and condemned female cheating are simply male-dominated cultures. Cheating is cheating, no matter who is doing it. It’s wrong.

They should be taking bonuses from bankers, not library books from schoolchildren. What kind of society are we building?

A boy admiring a pretty girl. A rare thing to be certain. But love-true love-is something else.

Advice is a form of nostalgia.

If Apple ever lowers the iPod's price and develops Windows software for it, watch out: the invasion of the iPod people will surely begin in earnest.

You may be liberal in your praise where praise is due: it costs nothing; it encourages much.

Love is a fine cushion to rest upon, but only hate can make you a better person.

I was assigned a Taliban "minder" who followed me everywhere. But he couldn't follow me into homes where there were women, so I took photos inside people's homes.

Health is worth more than learning.

The waist is a terrible thing to mind.