"This Gospel, then, is that God is our holy Creator and righteous Judge. He created us to glorify Him and enjoy Him forever, but we have all sinned, both in Adam as our representative head, and in our own individual actions (Rom. 5:12; 3:23). We therefore deserve death--spiritual separation from God in hell (Rom. 6:23; Eph. 2:3)--and are in fact already spiritually stillborn, helpless in our sins (Ps. 51:5; Rom. 37:1-14; John 3:3). But God sent His Son Jesus Christ, fully God and fully man (Phil. 2:5-11), to die the death that we deserved, and He raised Him up for our justification, proving that He was God's Son (Rom. 5:1; 1:4). If we would have Christ's perfect righteousness credited to us, and the penalty for our sins accounted to Him, we must repent of our sins and believe in Jesus Christ for salvation (2 Cor. 5:21; Mark 1:14-15)."
From The Deliberate Church by Mark Dever, p. 28.