Diamond cuts diamond.
Do as the Romans do.
Do as you would be done by.
Doing is better than saying.
Do it now.
Do nothing by halves.
Dont claim to know what you dont know.
Dont have too many irons in the fire.
Dont make a mountain out of a molehill.
Dont put off till tomorrow what should be done today.
Dont put the cart before the horse.
Dont trouble trouble until trouble troubles you.
Dont try to teach your grandmother to suck eggs.
Do well and have well.