1:7-11 The deceiver and his deceit are described: he brings some error concerning the person or office of the Lord Jesus. Such a one is a deceiver and an antichrist; he deludes souls, and undermines the glory and kingdom of the Lord Christ. Let us not think it strange, that there are deceivers and opposers of the Lord Christ's name and dignity now, for there were such, even in the apostles' times. The more deceivers and deceits abound, the more watchful the disciples must be. Sad it is, that splendid attainments in the school of Christ, should ever be lost. The way to gain the full reward is, to abide true to Christ, and constant in religion to the end. Firm cleaving to Christian truth unites us to Christ, and thereby to the Father also; for they are one. Let us equally disregard such as abide not in the doctrine of Christ, and those who transgress his commands. Any who did not profess and preach the doctrine of Christ, respecting him as the Son of God, and salvation by him from guilt and sin, were not to be noticed and countenanced. Yet in obeying this command, we must show kindness and a good spirit to those who differ from us in lesser matters, but hold firmly the all-important doctrines of Christ's person, atonement, and holy salvation.
8. Look to yourselves—amidst the widespread prevalence of deception so many being led astray. So Christ's warning, Mt 24:4, 5, 24.
we lose not … we receive—The oldest manuscripts and versions read, "That YE lose not, but that YE receive."
which we have wrought—So one oldest manuscript reads. Other very old manuscripts, versions, and Fathers, read, "which YE have wrought." The we being seemingly the more difficult reading is less likely to have been a transcriber's alteration. Look that ye lose not the believing state of "truth and love," which WE (as God's workmen, 2Co 6:1; 2Ti 2:15) were the instruments of working in you.
a full reward—of grace not of debt. Fully consummated glory. If "which YE have wrought" be read with very old authorities, the reward meant is that of their "work (of faith) and labor of love." There are degrees of heavenly reward proportioned to the degrees of capability of receiving heavenly blessedness. Each vessel of glory hanging on Jesus shall be fully happy. But the larger the vessel, the greater will be its capacity for receiving heavenly bliss. He who with one pound made ten, received authority over ten cities. He who made five pounds received five cities; each according to his capacity of rule, and in proportion to his faithfulness. Compare 1Co 15:41. "There is no half reward of the saints. It is either lost altogether, or received in full; in full communion with God" [Bengel]. Still no service of minister or people shall fail to receive its reward.