The ultimate authority must always rest with the individual's own reason and critical analysis.

Language is very powerful. Language does not just describe reality. Language creates the reality it describes.

To live is not merely to breathe; it is to act; it is to make use of our organs, senses, faculties - of all those parts of ourselves which give us the feeling of existence

If you don't want to slip up tomorrow, speak the truth today.

When you judge another, you do not define them, you define yourself.

When I stand before God at the end of my life, I would hope that I would not have a single bit of talent left, and could say, 'I used everything you gave me'.

A house divided against itself cannot stand.

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self.

Let him who would move the world first move himself.

He that cannot reason is a fool. He that will not is a bigot. He that dare not is a slave.

Although our intellect always longs for clarity and certainty, our nature often finds uncertainty fascinating.

The very essence of instinct is that it's followed independently of reason.

The more that you read, the more things you will know. The more that you learn, the more places you'll go.

No man has any natural authority over his fellow men.

Unfortunately, the clock is ticking, the hours are going by. The past increases, the future recedes. Possibilities decreasing, regrets mounting.

It is not enough to have a good mind; the main thing is to use it well.

Honesty is the first chapter in the book of wisdom.

A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools.

We thought that we had the answers, it was the questions we had wrong.

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

A house is not a home unless it contains food and fire for the mind as well as the body.