Man desired concord; but nature knows better what is good for his species; she desires discord. Man wants to live easy and content; but nature compels him to leave ease... and throw himself into roils and labors.

You only know me as you see me, not as I actually am

Act so that the maxim of your act could be made the principle of a universal law.

The more we come in contact with animals and observe their behaviour, the more we love them, for we see how great is their care of the young.

Freedom is the alone unoriginated birthright of man, and belongs to him by force of his humanity; and is independence on the will and co-action of every other in so far as this consists with every other person's freedom.

One is not rich by what one owns, but more by what one is able to do without with dignity.

If we knew that god exists, such knowledge would make morality impossible. For, if we acted morally from fear or fright, or confident of a reward, then this would not be moral. It would be enlightened selfishness.