How do we know that Christ alone is sufficient for salvation?

The sufficiency of Christ for salvation is biblically affirmed through the truth that He accomplished salvation on the cross. When Christ proclaimed, 'It is finished,' He confirmed that every aspect of redemption was fulfilled in Him for those He represents. This foundational belief is grounded in passages like Romans 4:25, which states that Christ was delivered for our offenses and raised for our justification. Therefore, any notion of needing additional works or human merit undermines the simplicity that is in Christ. Believers are invited to rest solely in Him for assurance of salvation, devoid of any reliance on personal achievements.