But in its essence friendship seems to consist more in giving than in receiving affection: witness the pleasure that mothers take in loving their children. Some mothers put their infants out to nurse, and though knowing and loving them, do not ask to be loved by them in return, if it be impossible to have this as well, but are content if they see them prospering; they retain their own love for them even though the children, not knowing them, cannot render them any part of what is due to a mother.
Aristotle, Nicomachean Ethics 1159a. The notion of parenthood as a kind of friendship with children plays a fairly important role in Aristotle's account of friendship.
