Justification goes beyond forgiveness. Not only are we forgiven because of Christ, but God also declares us righteous because of Christ. God requires two things of us: punishment for our sins and perfection in our lives. Our sins must be punished, and our lives must be righteous. But we cannot bear our own punishment (Ps. 49:7-8), and we cannot provide our own righteousness. “None is righteous; no, not one” (Rom. 3:10). Therefore, God, out of His immeasurable love for us, provided His own Son to do both. Christ bears our punishment, and Christ performs our righteousness. And when we receive Christ (John 1:12), all of His punishment and all of His righteousness is counted as ours (Rom. 4:4-6; 5:1, 19; 8:1; 10:4; 2 Cor. 5:21; Phil. 3:8-9).
John Piper