All wealth is the product of labor.

The great art of life is sensation, to feel that we exist, even in pain.

I discover myself on the verge of a usual mistake.

Repetition of the same thought or physical action develops into a habit which, repeated frequently enough, becomes an automatic reflex.

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

A bird doesn't sing because it has an answer, it sings because it has a song.

I want to know what passion is. I want to feel something strongly.

Storms make trees take deeper roots.

It is our choices...that show what we truly are, far more than our abilities.

For every man there exists a bait which he cannot resist swallowing.

Faith is taking the first step even when you can't see the whole staircase.

I believe that if you show people the problems and you show them the solutions they will be moved to act.

I do not care so much what I am to others as I care what I am to myself.

Great work requires great and persistent effort for a long time. … Character has to be established through a thousand stumbles.

Be happy, but never satisfied.

Waiting hurts. Forgetting hurts. But not knowing which decision to take is the worst of suffering

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

I am always doing that which I can not do, in order that I may learn how to do it.

The unexamined life is not worth living.

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

There is only one corner of the universe you can be certain of improving, and that's your own self.