John Calvin Commentary 1 Corinthians 14:33

"for God is not [a God] of confusion, but of peace. As in all the churches of the saints," — 1 Corinthians 14:33 (ASV)

For God is not of confusion. We must understand the word "Author," or some similar term. Here we have a most valuable statement, by which we are taught that we do not serve God unless we are lovers of peace, and eager to promote it. Whenever, therefore, there is a disposition to quarrel, there, it is certain, God does not reign. And how easy it is to say this! How very generally all have it in their mouths! Yet, in the meantime, most people fly into a rage about nothing, or they trouble the Church from a desire that they may, by some means, rise into view, and may seem to be somewhat. (Galatians 2:6).

Let us, therefore, bear in mind that, in judging the servants of Christ, this mark must be kept in view—whether or not they aim at peace and concord and, by conducting themselves peaceably, avoid contentions as much as possible; provided, however, we understand by this a peace of which the truth of God is the bond.

For if we are called to contend against wicked doctrines, even though heaven and earth should come together, we must, nevertheless, persevere in the contest. We must, indeed, in the first place, make it our aim that the truth of God may, without contention, maintain its ground; but if the wicked resist, we must set our face against them, and have no fear that the blame for the disturbances will be laid on us. For accursed is that peace of which revolt from God is the bond, and blessed are those contentions by which it is necessary to maintain the kingdom of Christ.

As in all the Churches. The comparison does not refer merely to what was said immediately before, but to the whole of the preceding account. “Until now, I have instructed you in nothing that is not observed in all the Churches, and, in this manner, they are maintained in peace. Let it be your care, therefore, to borrow what other Churches have found by experience to be beneficial and most profitable for maintaining peace.” His explicit mention of the term saints is emphatic—as if to exempt rightly constituted Churches from a mark of disgrace.