The quality of moral behavior varies in inverse ratio to the number of human beings involved.

For morality life is a war, and the service of the highest is a sort of cosmic patriotism which also calls for volunteers.

The fatal trait of the times is the divorce between religion and morality.

Morality cannot be legislated, but behavior can be regulated. Judicial decrees may not change the heart, but they can restrain the heartless.

There's always the hyena of morality at the garden gate, and the real wolf at the end of the street.

Every man has his moral backside which he refrains from showing unless he has to and keeps covered as long as possible with the trousers of decorum.

Men are more moral than they think and far more immoral than they can imagine.

The moral virtues, then, are produced in us neither by nature nor against nature. Nature, indeed, prepares in us the ground for their reception, but their complete formation is the product of habit.

I saw that all beings are fated to happiness: action is not life, but a way of wasting some force, an enervation. Morality is the weakness of the brain.

Morality is a private and costly luxury.