True friends are the whole world to one another; and he that is a friend to himself is also a friend to mankind. Even in my studies the greatest delight I take is of imparting it to others; for there is no relish to me in the possessing of anything without a partner.
Seneca the YoungerNo tree becomes rooted and sturdy unless many a wind assails it. For by its very tossing it tightens its grip and plants its roots more securely; the fragile trees are those that have grown in a sunny valley.
Seneca the Younger