As Peter means rock, the natural interpretation is that 'upon this rock' means upon thee. No other explanation would probably at the present day be attempted, but for the fact that the obvious meaning has been abused by Papists to the support of their theory. But we must not allow the abuse of a truth to turn us away from its use; nor must the convenience of religious controversy determine our interpretation of Scripture teaching. . . . Some hold that such a play upon words, "thou art Rock, and on this rock," is unworthy of our Lord. But there...