Mark 7:13

But if it is evident that subsequently heresies became more numerous and worse; and if, in time past, it was never at all prescribed nor written that only hands should be laid upon a heretic for repentance, and that so he might be communicated with; and if there is only one baptism, which is with us, and is within, and is granted of the divine condescension to the Church alone, what obstinacy is that, or what presumption, to prefer human tradition to divine ordinance, and not to observe that God is indignant and angry as often as human tradition relaxes and passes by the divine precepts, as He cries out, and says by Isaiah the prophet, "This people honoureth me with their lips, but their heart is far from me. But in vain do they worship me, teaching the doctrines and commandments of men." Also the Lord in the Gospel, similarly rebuking and reproving, utters and says, "Ye reject the commandment of God, that ye may keep your own tradition." Mindful of which precept, the blessed Apostle Paul himself also warns and instructs, saying, "If any man teach otherwise, and consent not to the wholesome words of our Lord Jesus Christ, and to His doctrine, he is proud, knowing nothing: from such withdraw thyself."

There is then no reason, dearest brother, for any one to think that the custom of certain persons is to be followed, who have thought in thee past that water alone should be offered in the cup of the Lord. For we must inquire whom they themselves have followed. For if in the sacrifice which Christ offered none is to be followed but Christ, assuredly it behoves us to obey and do that which Christ did, and what He commanded to be done, since He Himself says in the Gospel, "If ye do whatsoever I command you, henceforth I call you not servants, but friends." And that Christ alone ought to be heard, the Father also testifies from heaven, saying, "This is my well-beloved Son, in whom I am well pleased; hear ye Him." Wherefore, if Christ alone must be heard, we ought not to give heed to what another before us may have I thought was to be done, but what Christ, who is before all, first did. Neither is it becoming to follow the practice of man, but the truth of God; since God speaks by Isaiah the prophet, and says, "In vain do they worship me, teaching the commandments and doctrines of men." And again the Lord in the Gospel repeals this same saying, and says, "Ye reject the commandment of God, that ye may keep your own tradition." Moreover, in another place He establishes it, saying, "Whosoever shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven." But if we may not break even the least of the Lord's commandments, how much rather is it forbidden to infringe such important ones, so great, so pertaining to the very sacrament of our Lord's passion and our own redemption, or to change it by human tradition into anything else than what was divinely appointed! […]

Since these things are announced and are made plain to us, it is necessary that our obedience should wait upon the divine precepts; nor in matters of this kind can human indulgence accept any man's person, or yield anything to any one, when the divine prescription has interfered, and establishes a law. For we ought not to be forgetful what the Lord spoke to the Jews by Isaiah the prophet, rebuking, and indignant that they had despised the divine precepts and followed human doctrines. "This people," he says, honoureth me with their lips, but their heart is widely removed from me; but in vain do they worship me, teaching the doctrines and commandments of men." This also the Lord repeats in the Gospel, and says, "Ye reject the commandment of God, that ye may establish your own tradition." Having which things before our eyes, and solicitously and religiously considering them, we ought in the ordinations of priests to choose none but unstained and upright ministers, who, holily and worthily offering sacrifices to God, may be heard in the prayers which they make for the safety of the Lord's people, since it is written, "God heareth not a sinner; but if any man be a worshipper of God, and doeth His will, him He heareth." On which account it is fitting, that with full diligence and sincere investigation those should be chosen for God's priesthood whom it is manifest God will hear.

The Law, He says, teaches: "Honor your father and your mother" (Exodus 20:12); but you teach children to say to their parents: that which you want from me is corban, that is, dedicated to God. For the Pharisees, wishing to profit from the property of …

For the Pharisees, wishing to devour the offerings, instructed sons, when their parents asked for some of their property, to answer them, what thou hast asked of me is corban, that is, a gift, I have already offered it up to the Lord; thus the parents would not require it, as being offered up to the Lord, (and in that way profitable for their own salvation). Thus they deceived the sons into neglecting their parents, whilst they themselves devoured the offerings; with this therefore the Lord reproaches them, as transgressing the law of God for the sake of gain. Wherefore it goes on, Making the word of God of none effect through your traditions, which ye have delivered: and many such like things do ye; transgressing, that is, the commands of God, that ye may observe the traditions of men.