I confess that in 1901 I said to my brother Orville that man would not fly for fifty years.

I think nature's imagination Is so much greater than man's, she's never going to let us relax.

I don't know who my grandfather was; I'm much more concerned to know what his grandson will be.

Man needs his difficulties because they are necessary to enjoy success.

A long apprenticeship is the most logical way to success. The only alternative is overnight stardom, but I can't give you a formula for that.

To go too far is as bad as to fall short.

The greatest sin is to think yourself weak

The present is theirs; the future, for which I really worked, is mine.

The limits of the possible can only be defined by going beyond them into the impossible.

I discover myself on the verge of a usual mistake.

One person with a belief is equal to a force of ninety-nine who have only interests.

I wouldn't say I was the best manager in the business. But I was in the top one.

Write it on your heart that every day is the best day in the year.

Without ambition one starts nothing. Without work one finishes nothing. The prize will not be sent to you. You have to win it.

Courage is the thing. All goes if courage goes.

Live as if you were to die tomorrow. Learn as if you were to live forever.

If my life is going to mean anything, I have to live it myself.

Our life is what our thoughts make it.

A hero is no braver than an ordinary man, but he is brave five minutes longer.

I'd rather be an optimist and a fool than a pessimist and right.

My optimism wears heavy boots and is loud.