If you can't you must, and if you must you can.

You need a little bit of insanity to do great things.

So early in my life, I had learned that if you want something, you had better make some noise.

Sincerity and truth are the basis of every virtue.

The time is always right to do the right thing

Aim for the highest.

Work gives you meaning and purpose and life is empty without it.

No one is free who has not obtained the empire of himself. No man is free who cannot command himself.

The unexamined life is not worth living.

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

Good thoughts bear good fruit, bad thoughts bear bad fruit.

Above all things, respect yourself.

Be miserable. Or motivate yourself. Whatever has to be done, it's always your choice.

Storms make trees take deeper roots.

Only the wisest and stupidest of men never change.

I don’t think we are going to become extinct. We are very clever and very resourceful.

Failure is not our only punishment for laziness; there is also the success of others.

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

I know in my heart that man is good, that what is right will always eventually triumph, and there is purpose and worth to each and every life.

One man with courage is a majority.

It's not what you look at that matters, it's what you see.