17. Respect your friends, and keep faith with them. If you do betray a friend's confidence, you may as well forget you have a friend.
18. You have killed that friendship just as surely as if you had taken a weapon and killed an enemy.
19. Your friend is gone. You can no more get him back than you can get a bird to come back to your hand once you let it go.
20. Don't bother going after him. It's too late. He is gone, like a deer escaped from a trap.