THERE ARE TWO THINGS that don't have to mean anything, one is music and the other is laughter.

Nothing is divine but what is agreeable to reason.

I learned to honor human beings, and I would find myself far more useless than the common laborer if I did not believe that this consideration could impart to all others a value establishing the rights of humanity.

The sum total of all possible knowledge of God is not possible for a human being, not even through a true revelation. But it is one of the worthiest inquiries to see how far our reason can go in the knowledge of God.

Even a man's exact imitation of the song of the nightingale displeases us when we discover that it is a mimicry, and not the nightingale.

Ingratitude is the essence of vileness.

The question is not so much whether there is life on Mars as whether it will continue to be possible to live on Earth