My dear friend, clear your mind of cant.

Others have seen what is and asked why. I have seen what could be and asked why not.

Waste no more time arguing about what a good man should be. Be one.

With realization of one's own potential and self-confidence in one's ability, one can build a better world.

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

After climbing a great hill, one only finds that there are many more hills to climb.

In essence, if we want to direct our lives, we must take control of our consistent actions. It's not what we do once in a while that shapes our lives, but what we do consistently.

Self-confidence is the first requisite to great undertakings.

We could all take a lesson from crayons: some are sharp, some are beautiful, some have weird names, and all are different colors, but they still learn to live in the same box...

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

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

March on. Do not tarry. To go forward is to move toward perfection. March on, and fear not the thorns, or the sharp stones on life's path.

Be yourself, let you come through.

Nobody can hurt me without my permission.

I may not have gone where I intended to go, but I think I have ended up where I needed to be.

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

Take things as they are. Punch when you have to punch. Kick when you have to kick.

Effort only fully releases its reward after a person refuses to quit.

Any book that helps a child to form a habit of reading, to make reading one of his deep and continuing needs, is good for him.

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

I am as bad as the worst, but, thank God, I am as good as the best.