When Christ, who is our life, is revealed, then you also will be revealed with Him in glory. (3:4)
Although the world may not now recognize those whose lives are hidden with Christ in God, that will not always be the case. When Christ… is revealed at His second coming, we also will be revealed with Him in glory. The apostle John describes that scene in Revelation 19:11–13, 15–16:
I saw heaven opened; and behold, a white horse, and He who sat upon it is called Faithful and True; and in righteousness He judges and wages war. And His eyes are a flame of fire, and upon His head are many diadems; and He has a name written upon Him which no one knows except Himself. And He is clothed with a robe dipped in blood; and His name is called The Word of God.… And from His mouth comes a sharp sword, so that with it He may smite the nations; and He will rule them with a rod of iron; and He treads the wine press of the fierce wrath of God, the Almighty. And on His robe and on His thigh He has a name written, “KING OF KINGS, AND LORD OF LORDS.”
To this description of our Lord at His return in judgment, the vision adds that He will be accompanied by saints. John also wrote, “The armies which are in heaven, clothed in fine linen, white and clean, were following Him on white horses” (v. 14).
The verdict of eternity will reverse the verdicts of time. On that day, it will become apparent who really belongs to the Lord. “The Lord knows those who are His” (2 Tim. 2:19), and He will reveal them to the world. Lightfoot comments, “The veil which now shrouds your higher life from others, and even partly from yourselves, will then be withdrawn. The world which persecutes, despises, ignores now, will then be blinded with the dazzling glory of the revelation” (Lightfoot, p. 210). John wrote, “We know that, when He appears, we shall be like Him, because we shall see Him just as He is” (1 John 3:2).
Paul adds a wonderful parenthetical thought. He describes Christ as our life. Christ does not merely give life; He is life. Paul said, “I have been crucified with Christ; and it is no longer I who live, but Christ lives in me; and the life which I now live in the flesh I live by faith in the Son of God, who loved me, and delivered Himself up for me” (Gal. 2:20). He told the Corinthians that the life of Jesus was manifested in his body (2 Cor. 4:10). When facing possible martyrdom, he could say, “For to me, to live is Christ, and to die is gain” (Phil. 1:21).
The key to living the risen life is to have a life centered on Christ. The Son, not this present world, is the center of the believer’s universe.
MacArthur New Testament Commentary