John Calvin on 1 Corinthians 14:4

4. He that speaketh in another tongue, edifieth himself. In place of what he had said before — that he speaketh unto God, he now says — he speaketh to himself But whatever is done in the Church, ought to be for the common benefit. Away, then, with that misdirected ambition, which gives occasion for the advantage of the people generally being hindered! Besides, Paul speaks by way of concession: for when ambition makes use of such empty vauntings, “Iettent ainsi de grandes bouffees et se brauent en leur parler;” — “Make use in this way of great puffings, and boast themselves in their talk.” there is inwardly no desire of doing good; but Paul does, in effect, order away from the common society of believers those men of mere show, who look only to themselves.