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

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.

My dear friend, clear your mind of cant.

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

When you're curious, you find lots of interesting things to do.

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

No great discovery was ever made without a bold guess.

I don't care what people think or say about me, I know who I am.

The first rule is to keep an untroubled spirit. The second is to look things in the face and know them for what they are.

Storms make trees take deeper roots.

My optimism wears heavy boots and is loud.

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

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

Memories of our lives, of our works and our deeds will continue in others.

I may have had a lot of luck in my life, but I still need to find a challenge in the game.

The question isn't who is going to let me; it's who is going to stop me.

The only way to make sense out of change is to plunge into it, move with it and join the dance.

Lack of direction, not lack of time, is the problem. We all have twenty-four hour days.

Always remember you are braver than you believe, stronger than you seem, smarter than you think and twice as beautiful as you’ve ever imagined.

It's all to do with the training: you can do a lot if you're properly trained.

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