Why should Christians trust in Jesus alone for salvation?

Christ's sufficiency for salvation is a foundational belief in Reformed theology. Ephesians 2:8-9 makes it clear that salvation is by grace through faith, not by works, so that no one can boast. This speaks to Christ's complete work on the cross, where He bore our sins and accomplished the righteousness necessary for our salvation. Trusting in anything other than Jesus—whether it be our works, our will, or even our faith—is to undermine the grace of God. Jesus explicitly said, 'I am the way, the truth, and the life; no one comes to the Father except through Me' (John 14:6). Therefore, Christians are called to focus solely on Him, who is both our Savior and our Lord, and to rely on His merits rather than our own.