The greatest sin is to think yourself weak

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

If you spend too much time thinking about a thing, you'll never get it done.

Weakness of attitude becomes weakness of character.

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

When you believe in a thing, believe in it all the way, implicitly and unquestionably.

Ask for what you want and be prepared to get it!

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

Question with boldness even the existence of God; because, if there be one, he must more approve of the homage of reason than that of blindfolded fear.

A bird doesn't sing because it has an answer, it sings because it has a song.

Stop acting so small. You are the universe in ecstatic motion.

Keep your eyes on the stars, and your feet on the ground.

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

Motivation is what gets you started. Habit is what keeps you going.

A sudden dart when a little over a hundred feet from the end of the track, or a little over 120 feet from the point at which it rose into the air, ended the flight.

Whatever the mind of man can conceive and believe, it can achieve.

Courage is the most important of all the virtues, because without courage you can't practice any other virtue consistently. You can practice any virtue erratically, but nothing consistently without courage.

A man is but the product of his thoughts. What he thinks, he becomes.

You must find the place inside yourself where nothing is impossible.

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

Find out who you are. And do it on purpose.