How do we know that Christ is all we need for salvation?

The assurance that Christ is all we need for salvation is deeply rooted in Scripture. Ephesians 2:8-9 stresses that we are saved by grace through faith, not of works, ensuring that salvation is a gift from God. Additionally, Philippians 3:8 highlights the surpassing worth of knowing Christ Jesus. The idea is that if we feel the need to add anything to Christ—whether it be our works or personal merit—then we are failing to understand the completeness of His sacrificial work on the cross. He has borne our sins, given us His righteousness, and made us accepted in the Beloved (Ephesians 1:6). Hence, in Christ, we lack nothing for our justification and renewal.