C.S. Lewis (1898 - 1963)

Courage is not simply one of the virtues, but the form of every virtue at the testing point. C.S. Lewis

Marcus Tullius Cicero (106 BC - 43 BC)

Gratitude is not only the greatest of virtues, but the parent of all the others.
Marcus Tullius Cicero

John Locke

To love truth for truth's sake is the principal part of human perfection in this world, and the seed-plot of all other virtues. John Locke

Baruch Spinoza

Peace is not an absence of war, it is a virtue, a state of mind, a disposition for benevolence, confidence, justice.
Baruch Spinoza