To come out with clean hands.
To flog a dead horse.
To lock the stable-door after the horse is stolen.
To put off till Doomsday.
To throw a stone in one's own garden.
Too much knowledge makes the head bald.
Two heads are better than one.
The devil knows many things because he is old.
The falling out of lovers is the renewing of love.
The husband is always the last to know.
The morning sun never lasts a day.
The road to hell is paved with good intentions.
The way (the road) to hell is paved with good intentions.
There but for the grace of God, go I.
There's a time and a place for everything.
There's no time like the present.
This too shall pass.
Time is money.
To beat about the bush.
To cook a hare before catching him.
To get out of bed on the wrong side.
To look for a needle in a haystack.
To rob one's belly to cover one's back.
To throw dust in somebody's eyes.
Too much of a good thing is good for nothing.