If happiness is activity in accordance with excellence, it is reasonable that it should be in accordance with the highest excellence.
AristotleWe become just by the practice of just actions, self-controlled by exercising self-control, and courageous by performing acts of courage.
AristotleBut a man's best friend is the one who not only wishes him well but wishes it for his own sake (even though nobody will ever know it): and this condition is best fulfilled by his attitude towards himself - and similarly with all the other attributes that go to define a friend. For we have said before that all friendly feelings for others are extensions of a man's feelings for himself.
Aristotle