Commentaries
9:1-5 When we would have others do good, we must act toward them prudently and tenderly, and give them time. Christians should consider what is for the credit of their profession, and endeavour to adorn the doctrine of God their Saviour in all things. The duty of ministering to the saints is so plain, that there would seem no need to exhort Christians to it; yet self-love contends so powerfully against the love of Christ, that it is often necessary to stir up their minds by way of remembrance.
3. have I sent—we should say, "I send"; whereas the ancients put it in the past, the time which it would be by the time that the letter arrived.
the brethren—(2Co 8:18, 22)—Titus and the two others.
should be in vain in this behalf—"should be proved futile in this particular," however true in general (2Co 7:4). A tacit compliment, softening the sharp monition.
as I said—as I was saying (2Co 9:2).