1. The most moral people are those who are satisfied without having to show it externally. ——Plato

2. Only at the stage of social development when class antagonisms are not only eliminated, but also forgotten in actual life, can we transcend class antagonisms and transcend the memories of such antagonisms. , true human morality becomes possible. ——Engels

3. Morality is an acquisition—like music, like foreign languages, like piety poker and paralysis—no one is born with morality.

——Mark Twain