“To expound Scripture is to bring out of the text what is there and expose it to view. The expositor pries open what appears to be closed, makes plain what is obscure, unravels what is knotted and unfolds what is tightly packed. . . . Whether long or short, our responsibility as expositors is to open it up in such a way that it speaks its message clearly, plainly, accurately, relevantly, without addition, subtraction or falsification.”