Be friendly to your relations, but do not depend on your relationship.
If it were not for my own arm, my mouth would have nothing to eat.
FRIENDS, COMPANIONS
A friend is a second self and a third eye.
A true man is he who remembers his friend when he is absent, when he is in distress, and when he dies.
A friend is known only in adversity.
If your friend is sweet, do not eat him up.
If you would keep a friend, do not lend him money nor borrow from him.
Keep to your old friends—your new friends will not be so constant.