Friendship (n.) is an important feature of the good life.
Friendship (n.) is essentially a partnership.
Friendship (n.) is most itself when it is the friendship of men who are good, and alike in excellence... for these wish well alike to each other qua good, and they are good in themselves.
Friendship (n.) is the golden mean between quarrelsomeness and flattery.
Friendship (n.) is more important than justice: for, when men are friends, justice is unnecessary; but when men are just, friendship is still a boon.
Friendship (n.) is more necessary to the happy than to the unhappy; for happiness is multiplied by being shared.