Adam Clarke on Acts 19:20

So mightily grew the word of God, and prevailed - The Codex Bezae reads this verse thus: "So mightily grew the word of the Lord, and prevailed; and the faith of God increased and multiplied." It is probable that it was about this time that St. Paul had that conflict which he mentions, 1Cor 15:32 : If I after the manner of men, have fought with wild beasts at Ephesus, etc. See the note there. It means some severe trials not here mentioned, unless we may suppose him to refer to the ferocious insurrection headed by Demetrius, mentioned at the end of this chapter.