Aristotle
Some animals are cunning and evil-disposed, as the fox; others, as the dog, are fierce, friendly, and fawning. Some are gentle and easily tamed, as the elephant; some are susceptible of shame, and watchful, as the goose. Some are jealous and fond of ornament, as the peacock.
Walking is magic. Can't recommend it highly enough. I read that Plato and Aristotle did much of their brilliant thinking together while ambulating. The movement, the meditation, the health of the blood pumping, and the rhythm of footsteps... this is a primal way to connect with one's deeper self.
Anybody can become angry — that is easy, but to be angry with the right person and to the right degree and at the right time and for the right purpose, and in the right way — that is not within everybody's power and is not easy.
Excellence is an art won by training and habituation. We do not act rightly because we have virtue or excellence, but we rather have those because we have acted rightly. We are what we repeatedly do. Excellence, then, is not an act but a habit.
Young people are in a condition like permanent intoxication, because youth is sweet and they are growing.