You must keep your word, even if doing so costs you money.
You need sharp axes for knotty trees.
You do not really understand something unless you can explain it to your grandmother.
You don't get a headache from what other people have drunk.
You can't keep a word of thanks in your pocket.
You can't know for sure what people think.
You can't sew buttons on your neighbor's mouth.
You can't skin an ox twice.
You can't throw a handkerchief over somebody's mouth.
You can't tie a knot with one hand.
You cannot ride two horses with one ass.
You cannot sew buttons on your neighbor's mouth.
You can't build a house without corners, you can't talk without proverbs.
You can't catch the wind in a net.
You can't change your fate.
You can't have two forenoons in the same day.
You can't have your cake and eat it too.
You can't hide an awl in a sack.
You cannot drive straight on a twisting lane.
You cannot hang everything on a single peg.
You cannot jump higher than your head.
You can judge someone based on his surroundings. For instance, a person living in a messy house is messy.
You can pull and pull, but you can't milk a bull.
You can?t do everything at once.
You can?t expect perfection every time.