In "Biblical Perspective" Gordon Snider writes concerning Romans 5:10:

Paul presented additional reasons why the justified can have confidence. When we were enemies probably means not only that man was in rebellion against God, but that God also considered us to be deserving of punishment. We were reconciled . . . by the death of his Son. Reconciliation is a new term in Paul's argument. The cross did not change the fact that natural man is still a rebel against God, but it did make it possible for God to reach out to the sinner. Since the death of Christ has removed our alienation from God, we can have even greater confidence that we shall be saved by his life. The death of Christ changed our spiritual position. The life of Christ changes our daily performance and guarantees our future glorification.

Source: Studies in Romans: Adult Teacher's Insights, page 17.

"Therefore being justified by faith, we have peace with God through our Lord Jesus Christ" (Romans 5:1)

In "Doctrinal Discussion" Omar Lee writes:

The doctrine of justification by faith is an important doctrine that may be pushed to extremes in many ways. One way is to insist that one must “do” certain things to have saving faith. If we insist upon the “doing,” we will be pushed into rules that one must follow before he is saved. It then becomes necessary for some specific person here on earth to set these rules and say when they are kept. You would then have salvation by works through a God-appointed (it is said) person who is the final authority. Such a salvation is solely by works and will culminate in ceremonies that give no assurance to the person, nor do they change his life. Paul spoke by inspiration when he insisted that it is not law that saves, but faith. In the conservative holiness movement, we can be as insistent on works as others when we say that to get saved there must be a certain amount of praying, weeping, vowing, or time spent seeking. Are not these requirements works? We weaken the meaning of being reconciled by the blood of Christ. In fact, we make repentance a work rather than a condition of justification. We must never forget that faith is what brings true peace with God. Justification, then, is by faith and not by works. We can be so concerned about the process that we lose this great doctrine.

Source: Studies in the Psalms: Adult Teacher's Insights, page 14.