Lay down this rule of friendship: neither ask nor consent to do what is wrong. The plea, 'for friendship's sake,' is a discreditable one, and should not be admitted for a moment. We should ask from friends and do for friends only what is good.
They who dare to ask anything of a friend, by their very request seem to imply that they would do anything for the sake of that friend.
Justice extorts no reward, no kind of price; she is sought, therefore, for her own sake.
For how many things, which for our own sake we should never do, do we perform for the sake of our friends.