Inventing your own worship

Matthew 15:1–9; Mark 7:1–13

As the fault that is here corrected is not only common but highly dangerous, the passage is particularly worthy of our attention. We see the extraordinary insolence that is displayed by men as to the form and manner of worshipping God; for they are perpetually contriving new modes of worship, and when any one wishes to be thought wiser than others, he displays his ingenuity on this subject. I speak not of foreigners, but of the very domestics of the Church, on whom God has conferred the peculiar honor of declaring with their lips the rule of godliness. God has laid down the manner in which he wishes that we should worship him, and has included in his law the perfection of holiness. Yet a vast number of men, as if it were a light and trivial matter to obey God and to keep what he enjoins, collect for themselves, on every hand, many additions. Those who occupy places of authority bring forward their inventions for this purpose, as if they were in possession of something more perfect than the word of the Lord. This is followed by the slow growth of tyranny; for, when men have once assumed to themselves the right to issue commands, they demand a rigid adherence to their laws, and do not allow the smallest iota to be left out, either through contempt or through forgetfulness. The world cannot endure lawful authority, and most violently rebels against enduring the Lord's yoke, and yet easily and willingly becomes entangled in the snares of vain traditions; nay, such bondage appears to be, in the case of many, an object of desire. Meanwhile, the worship of God is corrupted, of which the first and leading principle is obedience. The authority of men is preferred to the command of God. Sternly, and therefore tyrannically, are the common people compelled to give their whole attention to trifles. This passage teaches us, first, that all modes of worship invented by men are displeasing to God, because he chooses that he alone shall be heard, in order to train and instruct us in true   godliness according to his own pleasure; secondly, that those who are not satisfied with the only law of God, and weary themselves by attending to the traditions of men, are uselessly employed; thirdly,   that an outrage is committed against God, when the inventions of men are so highly extolled, that the majesty of his law is almost lowered, or at least the reverence for it is abated.

—Calvin, John. Calvin's Complete Bible Commentaries (With Active Table of Contents in Biblical Order) (Kindle Locations 378304-378324). . Kindle Edition.