3:12-15 Christianity is not a fruitless profession; and its professors must be filled with the fruits of righteousness, which are by Jesus Christ, to the glory and praise of God. They must be doing good, as well as keeping away from evil. Let ours follow some honest labour and employment, to provide for themselves and their families. Christianity obliges all to seek some honest work and calling, and therein to abide with God. The apostle concludes with expressions of kind regard and fervent prayer. Grace be with you all; the love and favour of God, with the fruits and effects thereof, according to need; and the increase and feeling of them more and more in your souls. This is the apostle's wish and prayer, showing his affection to them, and desire for their good, and would be a means of obtaining for them, and bringing down on them, the thing requested. Grace is the chief thing to be wished and prayed for, with respect to ourselves or others; it is all good.
13. Bring … on their journey—Enable them to proceed forward by supplying necessaries for their journey.
Zenas—the contracted form of Zenodorus.
lawyer—a Jewish "scribe," who, when converted, still retained the title from his former occupation. A civil lawyer.
Apollos—with Zenas, probably the bearers of this Epistle. In 1Co 16:12, Apollos is mentioned as purposing to visit Corinth; his now being at Corinth (on the theory of Paul being at Corinth when he wrote) accords with this purpose. Crete would be on his way either to Palestine or his native place, Alexandria. Paul and Apollos thus appear in beautiful harmony in that very city where their names had been formerly the watchword of unchristian party work. It was to avoid this party rivalry that Apollos formerly was unwilling to visit Corinth though Paul desired him. Hippolytus mentions Zenas as one of the Seventy, and afterwards bishop of Diospolis.