Attitude, not Aptitude, determines Altitude.

I think, therefore I am.

Those who see the invisible can do the impossible.

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

You are the bows from which your children as living arrows are sent forth.

We learn from our gardens to deal with the most urgent question of the time: How much is enough?

Intelligence is a moral category.

If a man could have half of his wishes, he would double his troubles.

I don't like definitions, but if there is a definition of freedom, it would be when you have control over your reality to transform it, to change it, rather than having it imposed upon you. You can't really ask for more than that.

The cure for pain is in the pain.

Science has not yet taught us if madness is or is not the sublimity of the intelligence.

When you learn, teach, when you get, give.

Doubt is the origin of wisdom

Wisdom... comes not from age, but from education and learning.

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

Strength does not come from physical capacity. It comes from an indomitable will.

The secret of life, though, is to fall seven times and to get up eight times.

Instinct is a marvellous thing. It can neither be explained nor ignored.

Don't raise your voice, improve your argument.

Happiness is not an ideal of reason, but of imagination.

If you don't know where you're from, you'll have a hard time saying where you're going.