“For Christ’s love compels us, since we have reached this conclusion: If One died for all, then all died. And He died for all so that those who live should no longer live for themselves, but for the One who died for them and was raised” (2 Corinthians 5:14-15 HCSB).
While “…the love of Christ compels us…” seems to be a relatively straightforward idea, it may be more difficult to grasp what follows: “If One died for all, then all died.”
First, we can say the “One” who “died for all” in this passage is an obvious reference to Jesus and His sacrificial death. But what are we to make of the subsequent conclusion: “If One died for all, then all died“? Well, its often been said that Scripture is the best commentary on itself. In light of this, we can turn to another of Paul the Apostle’s Biblical letters to gain insight on this question…
“I have been crucified with Christ; 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 gave Himself for me” (Galatians 2:20).
These passages tell us that those who receive Christ essentially “die” with Him. In this sense, those who accept Jesus’ atoning, substitionary death consent to the end of a self-interested life in exchange for a Christ-oriented life. As Paul will later go on to say within this chapter, “Therefore, if anyone is in Christ, he is a new creation; old things have passed away, and look, new things have come” (2 Corinthians 5:17 HCSB).
One commentator offers a further observation on this passage…
“How did Jesus die for all? In the sense that His death is able to save all who will come to Him and is a demonstration of God’s love to all; but not in the sense that all are saved because Jesus died (which is the false doctrine of universalism). However, it is probable that in this context Paul means ‘all the saved’ when he says all.
There is no doubt that there is a sense in which Jesus died for the whole world: And He Himself is the propitiation for our sins, and not for ours only but also for the whole world (1 John 2:2). But the all Paul mentions here is probably ‘all the saved,’ because he also writes then all died. It can only be said that those who join themselves to Jesus by faith have spiritually died and risen again with Him (Romans 6:1-6).” (1)
(1) Guzik, Dave 2 Corinthians 5 – Ambassadors for Christ https://enduringword.com/bible-commentary/2-corinthians-5/