Thus he declared all foods clean

Gn 2,4-9.1 5-17; Ps 103; Mk 7,14-23
13 FEBRUARY

The Book of Leviticus contains a detailed list of both of every animal that a son of Israel could feed and every other from which he had to abstain from eating meat. This list strictly obliged everyone. The unclean animal eaten made the man unclean. Jesus declares this ancient law abrogated against the impurity that was contracted by eating an impure animal. For Jesus impure is what comes out of the heart.
The LORD said to Moses and Aaron, “Speak to the Israelites and tell them: Of all land animals these are the ones you may eat: any animal that has hoofs you may eat, provided it is cloven-footed and chews the cud. But you shall not eat any of the following that only chew the cud or only have hoofs: the camel, which indeed chews the cud, but does not have hoofs and is therefore unclean for you; the rock badger, which indeed chews the cud, but does not have hoofs and is therefore unclean for you; the hare, which indeed chews the cud, but does not have hoofs and is therefore unclean for you; and the pig, which does indeed have hoofs and is cloven-footed, but does not chew the cud and is therefore unclean for you. Their flesh you shall not eat, and their dead bodies you shall not touch; they are unclean for you. “Of the various creatures that live in the water, you may eat the following: whatever in the seas or in river waters has both fins and scales you may eat. But of the various creatures that crawl or swim in the water, whether in the sea or in the rivers, all those that lack either fins or scales are loathsome for you, and you shall treat them as loathsome. Their flesh you shall not eat, and their dead bodies you shall loathe. Every water creature that lacks fins or scales is loathsome for you. “Of the birds, these you shall loathe and, as loathsome, they shall not be eaten: the eagle, the vulture, the osprey, the kite, the various species of falcons, the various species of crows, the ostrich, the nightjar, the gull, the various species of hawks, the owl, the cormorant, the screech owl, the barn owl, the desert owl, the buzzard, the stork, the various species of herons, the hoopoe, and the bat. “The various winged insects that walk on all fours are loathsome for you. But of the various winged insects that walk on all fours you may eat those that have jointed legs for leaping on the ground; hence of these you may eat the following: the various kinds of locusts, the various kinds of grasshoppers, the various kinds of katydids, and the various kinds of crickets. All other winged insects that have four legs are loathsome for you. “Such is the uncleanness that you contract, that everyone who touches their dead bodies shall be unclean until evening, and everyone who picks up any part of their dead bodies shall wash his garments and be unclean until evening (Lev 11,1-25).
Jesus manifests himself Lord of the Law of the Father. He knows what has eternal value of it and what instead had a historical and therefore fleeting value. Every Ritual law is abrogated from the Book of Leviticus. Only the moral law remains, which is unchanging over the centuries. The new Law is collected by Jesus in the Sermon on the Mount, which is clothed with eternal immutability. The will of the Father is revealed in it in its highest truth. If someone – even an angel of God – wanted to add something, he could not. It enjoys absolute, divine and eternal perfection. The whole man is in it.
He summoned the crowd again and said to them, “Hear me, all of you, and understand. Nothing that enters one from outside can defile that person; but the things that come out from within are what defile.” When he got home away from the crowd his disciples questioned him about the parable. He said to them, “Are even you likewise without understanding? Do you not realize that everything that goes into a person from outside cannot defile, since it enters not the heart but the stomach and passes out into the latrine?” (Thus he declared all foods clean.) “But what comes out of a person, that is what defiles. From within people, from their hearts, come evil thoughts, unchastity, theft, murder, adultery, greed, malice, deceit, licentiousness, envy, blasphemy, arrogance, folly. All these evils come from within and they defile.”
That of Christ Jesus is the Word of the purity of the heart, mind, thoughts, desires, will, soul, spirit and body. Purity is the use of human nature in all its parts according to the truth of nature. When the truth of nature, created by God in his image and likeness, having become by redemption nature of the body of Christ, nature rendered spiritual by the Holy Spirit, is not respected, then man is unclean. If he is impure, he also does impure things. They come out of his impure nature.
Mother of God, Angels and Saints arrange that we become of very pure nature according to the Word.