How do we know Christ is sufficient for our salvation?
Answered in 3 sources
Christ is sufficient for salvation because through His death, He has perfected forever those who are being sanctified, eliminating any need for additional works.
The sufficiency of Christ for salvation is affirmed in the New Testament as the only means by which believers are made righteous before God. Paul underscores that all the requirements of the law are fulfilled in Christ, and by His one offering, He has perfected forever those who are sanctified. In Hebrews 10:14, it is made clear that no further sacrifices are needed because Christ's sacrifice is complete and sufficient. This eliminates the necessity of circumcision or any works of law for justification. Believers are called to rest in the completed work of Christ rather than rely on their own efforts for acceptance with God.
Commentary