Change before you have to.

Superman don't need no seat belt. Comment to a flight attendant, who replied: "Superman don't need no airplane, either."

If you always put limit on everything you do, physical or anything else, it will spread into your work and into your life. There are no limits. There are only plateaus, and you must not stay there, you must go beyond them.

History does not repeat itself, but it rhymes.

The greatest deception men suffer is from their own opinions.

Simplicity is the ultimate sophistication.

Sometimes I wonder whether the world is being run by smart people who are putting us on, or by imbeciles who really mean it.

Suppose you were an idiot. And suppose you were a member of Congress. But I repeat myself.

Iron rusts from disuse; stagnant water loses its purity and in cold weather becomes frozen; even so does inaction sap the vigor of the mind.

He who wishes to be rich in a day will be hanged in a year.

Life well spent is long.

Everybody talks about the weather, but nobody does anything about it.

He who thinks little, errs much.

We ought not to desire the impossible.

It is easier to resist at the beginning than at the end.

Fortune and love favor the brave.

Fear arises sooner than anything else.

Reprove your friend in secret and praise him openly.

Patriotism is supporting your country all the time, and your government when it deserves it.

Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover.

He who walks straight rarely falls.

Where there is most feeling, there is the greatest martyrdom.

The acquisition of any knowledge is always of use to the intellect, because it may thus drive out useless things and retain the good. For nothing can be loved or hated unless it is first known.

Truth was the only daughter of Time.

Wisdom is the daughter of experience.