“Let us take, for example, the bending of the knee which is made in public prayer. It is asked, whether this is a human tradition, which any one is at liberty to repudiate or neglect? I say, that it is human, and that at the same time it is divine. It is of God, inasmuch as it is a part of that decency, the care and observance of which is recommended by the apostle; and it is of men, inasmuch as it specially determines what was indicated in general, rather than expounded.

From this one example, we may judge what is to be thought of the whole class—viz. that the whole sum of righteousness, and all the parts of divine worship, and everything necessary to salvation, the Lord has faithfully comprehended, and clearly unfolded, in his sacred oracles, so that in them he alone is the only Master to be heard. But as in external discipline and ceremonies, he has not been pleased to prescribe every particular that we ought to observe (he foresaw that this depended on the nature of the times, and that one form would not suit all ages), in them we must have recourse to the general rules which he has given, employing them to test whatever the necessity of the Church may require to be enjoined for order and decency.

Lastly, as he has not delivered any express command, because things of this nature are not necessary to salvation, and, for the edification of the Church, should be accommodated to the varying circumstances of each age and nation, it will be proper, as the interest of the Church may require, to change and abrogate the old, as well as to introduce new forms. I confess, indeed, that we are not to innovate rashly or incessantly, or for trivial causes. Charity is the best judge of what tends to hurt or to edify: if we allow her to be guide, all things will be safe.”

— John Calvin, Institutes, Bk. 4, 10:30(Paragraph divisions mine).


Quoted by John Piper in Part 2 of this helpful sermon series.