He who does wrong does wrong against himself. He who acts unjustly acts unjustly to himself, because he makes himself bad.
Marcus AureliusFor nowhere either with more quiet or more freedom from trouble does a man retire than into his own soul, particularly when he has within him such thoughts that by looking into them he is immediately in perfect tranquility; and I affirm that tranquility is nothing else than the good ordering of the mind.
Marcus Aurelius