1 Corinthians 6:12

Here he glances at the gluttons. For since he intends to assail the fornicator again, and fornication arises from luxuriousness and want of moderation, he strongly chastises this passion. It cannot be that he speaks thus with regard to things forbidden, such not being "lawful:" but of things which seem to be indifferent. To illustrate my meaning: "It is lawful," he says, "to eat and to drink; but it is not expedient with excess." And so that marvellous and unexpected turn of his, which he is often wont to adopt; bringing his argument clear round to its contrary, this he manages to introduce here also; and he signifies that to do what is in one's power not only is not expedient, but even is not a part of power, but of slavery. And first, he dissuades them on the ground of the inexpediency of the thing, saying, "they are not expedient:" in the next place, on that of its contrariety to itself, saying, "I will not be brought under the power of any." This is his meaning: "You are at liberty to eat," says he; "well then, remain in liberty, and take heed that you do not become a slave to this appetite: for he who uses it properly, he is master of it; but he that exceeds the proper measure is no longer its master but its slave, since gluttony reigns paramount within him." Do you perceive how, where the man thought he had authority Paul points out that he is under authority? For this is his custom, as I was saying before, to give all objections a turn the contrary way. It is just this which he has done here. For mark; each of them was saying, "I have power to live luxuriously." He replies, "In doing so, thou art not so much acting as one who had power over a thing, but rather as being thyself subject to some such power. For thou hast not power even over thine own belly, so long as thou art dissolute, but it hath power over thee." And the same we may say both of riches and of other things.