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

Science is organized knowledge. Wisdom is organized life.

There is geometry in the humming of the strings. There is music in the spacing of the spheres.

An intelligent hell would be better than a stupid paradise.

Respect yourself if you would have others respect you.

Not everything that can be counted counts, and not everything that counts can be counted.

Sometimes you will never know the value of a moment until it becomes a memory.

A house divided against itself cannot stand.

Intelligence is a moral category.

Anger begins in folly, and ends in repentance.

You are not a drop in the ocean. You are the entire ocean, in a drop.

Stupidity is a talent for misconception.

The place where you made your stand never mattered. Only that you were there...and still on your feet.

Immoderate desire is the mark of a child, not a man.

The best revenge is to be unlike him who performed the injury.

Tomorrow hopes we have learned something from yesterday.

Wisdom begins at the end.

Desire is the very essence of man.

Those who see the invisible can do the impossible.

The pendulum of the mind oscillates between sense and nonsense, not between right and wrong.

Out of suffering have emerged the strongest souls; the most massive characters are seared with scars.