We can remove most sins if we have a witness standing by as we are about to go wrong. The soul should have someone it can respect, by whose example it can make its inner sanctum more inviolable. Happy is the person who can improve others, not only when present, but even when in their thoughts! —SENECA, MORAL LETTERS, 11.9

Holiday, Ryan; Hanselman, Stephen. The Daily Stoic: 366 Meditations on Wisdom, Perseverance, and the Art of Living (p. 80). Penguin Publishing Group. Kindle Edition.