Don't blow your own trumpet. Do as you would be done by. He bears misery best that hides it most. He that hurts another, hurts himself. Patience is a virtue.
Persuasion is better than force.
Spare the rod and spoil the child. A good thing is all the sweeter when won with pain. A man too careful of danger lives in continual torment. All promises are either broken or kept. An eye for an eye and a tooth for a tooth.