What does it mean that Christ alone is sufficient for salvation?

The doctrine of Christ alone asserts that Jesus Christ is the only way to salvation, as affirmed in 2 John 9, which states that anyone who does not abide in the doctrine of Christ does not have God. This is significant because it emphasizes that there is no other mediator or means by which believers can approach God. Jesus, in His incarnate form, fully represents both God and humanity, making His sacrifice uniquely effective for the atonement of sin. The sufficiency of Christ is also evidenced in His resurrection, demonstrating His victory over sin and death. Thus, salvation is not achieved through works or any other intermediaries, but solely through faith in Christ's completed work on the cross. This truth promotes reliance on Christ alone rather than on personal efforts or achievements.