Lend yourself to others, but give yourself to yourself.

Freedom from the desire for an answer is essential to the understanding of a problem.

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

If you paint in your mind a picture of bright and happy expectations, you put yourself into a condition conducive to your goal.

When all is said and done, more is said than done.

We cannot solve our problems with the same thinking we used when we created them.

Though the road's been rocky it sure feels good to me.

It's always too early to quit.

Change your thoughts and you change your world.

First ask yourself: What is the worst that can happen? Then prepare to accept it. Then proceed to improve on the worst.

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.

Freedom and independence form my character.

To give pleasure to a single heart by a single act is better than a thousand heads bowing in prayer.

To attain the impossible, one must attempt the absurd.

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

Don't ever take a fence down until you know why it was put up.

I am always doing what I cannot do yet, in order to learn how to do it.

Wealth is not about having a lot of money; it's about having a lot of options.

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

Never look back unless you are planning to go that way.

People should pursue what they're passionate about. That will make them happier than pretty much anything else.