don't hold your breath

Don't cut off your nose to spite your face, Don't fire until you see the whites of their eyes, Don't give up the ship, don't go there, Don't hide your light under a bushel, don't hold your breath, Don't judge a book by its cover, don't-know, don't let the grass grow under one's feet, Don't lock the stable door after the horse has been stolen, Don't look a gift horse in the mouth