Matthew 15:17

Some cavil at this, that the Lord is ignorant of physical disputation in saying that all food goes into the belly, and is cast out into the draught; for that the food, as soon as it is taken, is distributed through the limbs, the veins, the marrow, and the nerves. But it should be known, that the lighter juices, and liquid food after it has been reduced and digested in the veins and vessels, passes into the lower parts through those passages which the Greeks call 'pores,' and so goes into the draught.

The nourishment of the body being first changed into corruption, that is, having lost its proper form, is absorbed into the substance of the limbs, and repairs their waste, passing through a medium into another form, and by the spontaneous motion of the parts is so separated, that such portions as are adapted for the purpose are taken up into the structure of this fair visible, while such as are unfit are rejected through their own passages. One part consisting of fæces is restored to earth to reappear again in new forms; another part goes off in perspiration, and another is taken up by the nervous system for the purposes of reproduction of the species.

And the Lord includes herein man's two mouths, one of the body, one of the heart. For when He says, Not all that goeth into the mouth defileth a man, He clearly speaks of the body's mouth; but in that which follows, He alludes to the mouth of the heart, But those things which proceed out of the mouth, come forth from the heart, and they defile a man.

What then saith Peter? He saith not, "What can this be which Thou hast said?" but as though it were full of obscurity, he puts his question. And he saith not, "Why hast thou spoken contrary to the law?" for he was afraid, lest he should be thought to have taken offense, but asserts it to be obscure. However, that it was not obscure, but that he was offended, is manifest, for it had nothing of obscurity. Wherefore also He rebukes him, saying, "Are ye also yet without understanding?" For as to the multitude, they did not perhaps so much as understand the saying; but themselves were the persons offended. Wherefore, whereas at first, as though asking in behalf of the Pharisees, they were desirous to be told; when they heard Him denouncing a great threat, and saying, "Every plant, which my heavenly Father hath not planted, shall be rooted up," and, "They are blind leaders of the blind," they were silenced. But he, always ardent, not even so endures to hold his peace, but saith, "Declare unto us this parable." What then saith Christ? With a sharp rebuke He answers, "Are ye also yet without understanding? Do ye not yet understand?" But these things He said, and reproved them, in order to cast out their prejudice; He stopped not however at this, but adds other things also, saying, "That whatsoever entereth in at the mouth goeth into the belly, and is cast out into the draught; but those things which proceed out of the mouth come forth from the heart, and they defile the man. For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, blasphemies, false-witnessings: and these are the things that defile the man: but to eat with unwashen hands defileth not the man." Seest thou how sharply He deals with them, and in the way of rebuke? Then He establishes His saying by our common nature, and with a view to their cure. For when He saith, "It goeth into the belly, and is cast out into the draught," he is still answering according to the low views of the Jews. For He saith, "it abides not, but goes out:" and what if it abode? it would not make one unclean. But not yet were they able to hear this. And one may remark, that because of this the lawgiver allows just so much time, as it may be remaining within one, but when it is gone forth, no longer. For instance, at evening He bids you wash yourself, and so be clean; measuring the time of the digestion, and of the excretion. But the things of the heart, He saith, abide within, and when they are gone forth they defile, and not when abiding only. And first He puts our evil thoughts, a kind of thing which belonged to the Jews; and not as yet doth He make His refutation from the nature of the things, but from the manner of production from the belly and the heart respectively, and from the fact that the one sort remains, the other not; the one entering in from without, and departing again outwards, while the others are bred within, and having gone forth they defile, and then more so, when they are gone forth. Because they were not yet able, as I said, to be told these things with all due strictness. But Mark saith, that "cleansing the meats," He spake this. He did not however express it, nor at all say, "but to eat such and such meats defileth not the man," for neither could they endure to be told it by Him thus distinctly. And accordingly His conclusion was, "But to eat with unwashen hands defileth not the man."