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

You're never as good as everyone tells you when you win, and you're never as bad as they say when you lose.

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

Fantasy is an exercise bicycle for the mind. It might not take you anywhere, but it tones up the muscles that can. Of course, I could be wrong.

There is no refuge from confession but suicide; and suicide is confession.

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

All wealth is the product of labor.

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

Do not be afraid. Do not be satisfied with mediocrity. Put out into the deep and let down your nets for a catch.

Anything that makes weak - physically, intellectually and spiritually, reject it as poison.

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

We are all motivated by a keen desire for praise, and the better a man is, the more he is inspired by glory.

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

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

I discover myself on the verge of a usual mistake.

The secret of health for both mind and body is not to mourn for the past, nor to worry about the future, but to live the present moment wisely and earnestly.

Work gives you meaning and purpose and life is empty without it.

If you can accept losing, you can't win.

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

However many holy words you read, however many you speak, what good will they do you if you do not act on upon them?

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