One must maintain a little bittle of summer, even in the middle of winter.

Never let the future disturb you. You will meet it, if you have to, with the same weapons of reason which today arm you against the present.

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

As long as I'm in great shape, nobody beats me, for sure.

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

The deeds you do may be the only sermon some persons will hear today.

I don't know who my grandfather was; I'm much more concerned to know what his grandson will be.

He that can have patience can have what he will.

People who are unable to motivate themselves must be content with mediocrity, no matter how impressive their other talents.

No matter what people tell you, words and ideas can change the world.

The starting point of all achievement is desire.

Don't complain about the snow on your neighbor's roof when your own doorstep is unclean.

If you don't like the road you're walking, start paving another one.

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

Some people feel the rain. Others just get wet.

Yesterday is gone. Tomorrow has not yet come. We have only today. Let us begin.

When everything seems to be going against you, remember that the airplane takes off against the wind, not with it ....

Perseverance is failing 19 times and succeeding the 20th.

People don't realize how a man's whole life can be changed by one book.

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

Do not pray for easy lives. Pray to be stronger men.