Sayings from the Meditations — Marcus Aurelius

Waste no more time arguing about what a good man should be. Be one. The best revenge is not to be like the one who wronged you. Look within: within is the fountain of good, and it will never run dry if you keep digging. Confine yourself to the present. Very little is needed to make a happy life; it is all within yourself, in your way of thinking. The soul takes on the colour of its thoughts.