Timeless truths about reconciliation. Sin separates us from God. Nothing you can do will reconcile you to God. So Jesus Christ came into the world to pay the penalty for your sin. When you trust in Christ as the Lord God, you have peace with God. Your relationship with your creator totally changes. Now you stand before Him justified. As the Judge of all mankind, God declares you “just” because Jesus paid the price for your sin.
Romans 5 also teaches us the fact that sin entered the world by one man, Adam. All mankind fell in Adam. But that also means that salvation came through one man, Jesus Christ. So all mankind can be saved through Him.