How do we know that Christ's atonement is sufficient for salvation?

The sufficiency of Christ’s atonement is a foundational truth of sovereign grace theology. When Christ died on the cross, He did not simply make salvation possible; He accomplished it for all those whom He represented. Scripture affirms that Jesus is the perfect sacrifice whose death propitiated God's wrath and redeemed His people. John highlights that there will not be anyone in hell for whom Christ died, reinforcing that His atonement is effective and complete. This understanding gives believers the assurance that their salvation is secure, as it is based solely on Christ's work and not their own efforts or righteousness.