There are causes worth dying for, but none worth killing for.

The moral arc of the universe bends toward justice, but it doesn't bend on its own.

We have, in fact, two kinds of morality side by side: one which we preach but do not practice, and another which we practice but seldom preach.

Morality is the herd instinct in the individual.

The true measure of a man is how he treats someone who can do him absolutely no good.

What is moral is what you feel good after and what is immoral is what you feel bad after.

Compassion is the basis of morality.

The first step in the evolution of ethics is a sense of solidarity with other human beings.

Moral excellence comes about as a result of habit. We become just by doing just acts, temperate by doing temperate acts, brave by doing brave acts.

One who makes no mistakes makes nothing at all. But one who makes no moral mistakes remains a child forever.

Morality, like art, means drawing a line someplace.

We are what we pretend to be, so we must be careful about what we pretend to be.

The greatest moral progress happens not when we condemn evil, but when we understand it.

Your morality is not defined by what you condemn, but by what you're willing to sacrifice for.

The ultimate measure of a man is not where he stands in moments of comfort and convenience, but where he stands at times of challenge and controversy.