Those who can not change their minds can not change anything.

Choose rather to be strong of soul than strong of body.

Just remember, once you're over the hill you begin to pick up speed.

The path to success is to take massive, determined action.

Let no man pull you low enough to hate him.

Act as if the maxim of your action were to become through your will a general natural law

Wonder is the beginning of wisdom.

He who is cruel to animals becomes hard also in his dealings with men. We can judge the heart of a man by his treatment of animals.

If you have no problems, then you have no clue to what is going.

True knowledge lies in knowing how to live.

Wrong life cannot be lived rightly.

Yesterday I was clever, so I wanted to change the world. Today I am wise, so I am changing myself.

The only real laughter comes from despair.

No one cares how much you know, until they know how much you care

If I speak of myself in different ways, that is because I look at myself in different ways.

And no one will listen to us until we listen to ourselves.

It takes a great deal of bravery to stand up to our enemies, but just as much to stand up to our friends.

Do not reveal what you have thought upon doing, but by wise council keep it secret being determined to carry it into execution.

All great achievements require time.

Kind words don't cost much. Yet they accomplish much.

Don't criticize what you don't understand, son. You never walked in that man's shoes.