Aristotle

He who is unable to live in society, or who has no need because he is sufficient for himself, must be either a beast or a god.

Whosoever is delighted in solitude is either a wild beast or a god.

Love is composed of a single soul inhabiting two bodies.

Perfect friendship 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 is essentially a partnership.

Wishing to be friends is quick work, but friendship is a slow ripening fruit.

My best friend is the man who in wishing me well wishes it for my sake.

He who hath many friends hath none.

A friend to all is a friend to none.

The state comes into existence for the sake of life and continues to exist for the sake of good life.