Know thyself.

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

Self-confidence is the first requisite to great undertakings.

To give real service, you must add something which cannot be bought or measured with money.

Character isn't something you were born with and can't change, like your fingerprints. It's something you weren't born with and must take responsibility for forming.

We all have possibilities we don't know about. We can do things we don't even dream we can do.

The starting point of all achievement is desire.

Trust in dreams, for in them is hidden the gate to eternity.

For a man who no longer has a homeland, writing becomes a place to live.

Don't find fault, find a remedy; anybody can complain

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

To be yourself in a world that is constantly trying to make you something else is the greatest accomplishment.

The fact that the great scientist believed in flying machines was the one thing that encouraged us to begin our studies.

No great discovery was ever made without a bold guess.

You don't need a weather man to know which way the wind blows

He was a dreamer, a thinker, a speculative philosopher... or, as his wife would have it, an idiot.

A man should look for what is, and not what he thinks should be.

People who are unable to motivate themselves must be content with mediocrity, no matter how impressive their other talents.

He who is not courageous enough to take risks will accomplish nothing in life

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

Today I shall behave, as if this is the day I will be remembered.