If you start to think of your physical and moral condition, you usually find that you are sick.

Johann Wolfgang von Goethe

They who have reasoned ignorantly, or who have aimed at effecting their personal ends by flattering the popular feeling, have boldly affirmed that ‘one man is as good as another;’ a maxim that is true in neither nature, revealed morals, nor political theory.

James Fenimore Cooper

Love is moral even without legal marriage, but marriage is immoral without love.

Ellen Key

A fool bolts pleasure, then complains of moral indigestion.

Miguel de Unamuno

Fearlessness is the first requisite of spirituality. Cowards can never be moral.

Mahatma Gandhi

Why should a Man be Moral? Because this strengthens his will.

Swami Vivekananda

There is no moral precept that does not have something inconvenient about it.

Denis Diderot

The highest possible stage in moral culture is when we recognize that we ought to control our thoughts.

Charles Darwin

There is nothing training cannot do. Nothing is above its reach. It can turn bad morals to good; it can destroy bad principles and recreate good ones; it can lift men to angelship.

Mark Twain

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

Sigmund Freud

The ultimate test of a moral society is the kind of world that it leaves to its children.

Dietrich Bonhoeffer

Music is a discipline, and a mistress of order and good manners, she makes the people milder and gentler, more moral and more reasonable.

Martin Luther

It is as hard and severe a thing to be a true politician as to be truly moral.

Francis Bacon

Without man and his potential for moral progress, the whole of reality would be a mere wilderness, a thing in vain, and have no final purpose.

Immanuel Kant