2 Cor 5 14For Christ's love compels us, because we are convinced that one died for all, and therefore all died. 15And he died for all, that those who live should no longer live for themselves but for him who died for them and was raised again.
16So from now on we regard no one from a worldly point of view. Though we once regarded Christ in this way, we do so no longer. 17Therefore, if anyone is in Christ, he is a new creation; the old has gone, the new has come!"
When we are saved we receive all that Christ has obtained. We no longer live on the principle of works. Before we were saved we lived to be accepted by fulfilling our responsibilities. But the apostle is saying that our salvation was more than offering of ability to act according to the law. This is more radical than that philosophy. He is really saying that you are no longer your old identity. You are becoming someone else. This is why he is teaching that in the christian community we look at each other with an eternal view. Our failures and successes are not the primary focus. We are looking at the person as becoming complete by understanding their potential of what they will be like when there is no remembrance of them as they were like in their old life.

The apostle is saying that our salvation was more than a moral change. We became like Christ by dying to what we were. So our growth is obtained by reckoning ourselves dead to all the opposition.You see our eternal mindset forces us to give up our confidence in breaking our lives down into parts. In eternity there are no parts. Parts are the measurement of time. There is a beginning and ending when we view this life in parts. But God is sovereign over time. This becomes a conflict of wills. You see God not only created all things but He orders all things by speaking them into existence from nothing. Gods creation is the display of perfect unity. The very existence of a thing is the display of Gods perfect will. So all things are a display of Gods will working in unity outside of time. So the apostle is saying that we must die to our confidence in viewing life under the control of time.
We cannot be confident in changing under the control of time. We can only be confident that all of our opposition has been cursed. We do not live in a time oriented world. We have been made citizens of another kingdom. This kingdom is perfect worked out by Gods commands. You see in the ot that when the scripture says that God commanded the people it is reflected in the next sentence that they obeyed those commands. Gods elect are given Christ righteousness .They are seen as perfectly obeying Gods commands. This is why the ot distinguishes between national rebellion and Gods success with His remnant. We live in an eternal kingdom in which we experience change by God ordering all things from before the creation of the world. God cannot fail.