Politeness is better than logic. You can often persuade when you cannot convince.
It ain't no disgrace for a man to fall, but to lie there and grunt is.
Be kind to your mother-in-law, but pay for her board at some good hotel.
Occasions are rare; and those, who know how to seize upon them, are rarer.
If you do not know how to lie, cheat, and steal, turn your attention to politics and learn.
Half of the troubles of this life can be traced to saying yes too quickly and not saying no soon enough.