I've often heard it said, as the common proverb goes, that a fool can teach a wise man well.
Don't limp in front of the lame.
Between two stools one sits on the ground.
I'd gladly do without a valet. I'm never so well treated as when I'm without a valet.
I do not drink more than a sponge.
War begun without good provision of money beforehand for going through with it is but as a breathing of strength and blast that will quickly pass away. Coin is the sinews of war.