John Calvin on Acts 18:15-16

15. Of words and names. These words are not well packed together. Yet Gallio speaketh thus of the law of God by way of contempt, as if the Jewish religion did consist only in words and superfluous questions. And surely (as the nation was much given to contention) it is not to be doubted but that many did trouble themselves and others with superfluous trifles. Yea, we hear with what Paul hitteth them in the teeth “Quid illis exprobet Paulis,” how Paul upbraideth them. in many places, especially in the Epistle to Titus, (Titus 1:14, and Titus 3:9.) Yet Gallio is not worthy to be excused who doth mock the holy law of God together with their curiosity. For as it behooved him to cut off all occasion of vain contentions in words, so we must, on the other side, know that when the worship of God is in hand, the strife is not about words, but a matter of all other most serious is handled.