How do we know that salvation through Christ is sufficient?

In John 9:25, the man born blind asserts, 'One thing I know: that whereas I was blind, now I see.' This underscores the transformative power of Christ's salvation, which is not rooted in human works but in God's grace. Ephesians 2:8-9 further supports this, affirming that we are saved by grace through faith, and not of ourselves. This illustrates that our assurance of salvation rests not in our merit but in Christ's finished work. His ability to change lives validates the truth of salvation, making it clear that in Him alone is our hope.