We are citizens of the world. The tragedy of our times is that we do not know this.

A liar will not be believed even when he speaks the truth.

The starting point of all achievement is desire. Keep this constantly in mind. Weak desires bring weak results, just as a small amount of fire makes a small amount of heat.

I can never stand still. I must explore and experiment. I am never satisfied with my work. I resent the limitations of my own imagination.

Only in the darkness, you are able to see the stars.

For every man there exists a bait which he cannot resist swallowing.

Do what you can, with what you have, where you are.

Every intention is a trigger for transformation.

Defeat is not defeat unless accepted as a reality-in your own mind.

This is one small step for a man, one giant leap for mankind.

When I'm good, I'm very good, but when I'm bad, I'm better.

I don't think necessity is the mother of invention. Invention ... arises directly from idleness, possibly also from laziness. To save oneself trouble.

I am not bound to win, but I am bound to be true. I am not bound to succeed, but I am bound to live by the light that I have. I must stand with anybody that stands right, and stand with him while he is right, and part with him when he goes wrong.

Sovereignty is not given, it is taken.

Treat a work of art like a prince. Let it speak to you first.

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

Find out who you are and do it on purpose.

Only the wisest and stupidest of men never change.

Diligence is the mother of good fortune. And idleness, its opposite, never brought a man to the goal of any of his best wishes.

You have to make the rules, not follow them.

We should not give up and we should not allow the problem to defeat us.