The exception which proves the rule.
The hand that rocks the cradle rules the world.
The more haste, the less speed.
The proof of the pudding is in the eating.
The tongue of idle persons is never idle.
There are none so blind as those, that will not see.
There is reason in the roasting of eggs.
There's no smoke without fire.
Third time lucky.
Time heals all wounds.
To be in one's birthday suit.
To come off with flying colours.
To fish in troubled waters.
To listen is to learn, and to understand is to inspire.
To put (set) the cart before the horse.
To the victor go the spoils.
Too many cooks spoil the broth.
Two blacks do not make a white.
Walls have ears.
The devil finds work for idle hands to do.
The eyes are the window of the soul.
The heart that once truly loves never forgets.
The more the merrier.
The receiver is as bad as the thief.
The truth will out.