We all inherited something from Adam. What did we inherit? Sin. The gospel proclaims not merely that we do sinful things, but that we are sinful by nature. Our problem is deeper than our behaviour. We don't simply need improvement or healing—we need new life. We need to be born again.
What did the second Adam do? He obeyed. Where Adam failed through disobedience, Christ succeeded through perfect obedience. Adam's disobedience brought sin, death, and condemnation. Christ's obedience brought grace, life, righteousness, and justification.