How do we know faith in Jesus is enough for salvation?

The assurance that faith in Jesus Christ is enough for salvation rests on the belief that He fulfilled all righteously and bore our sins in His body. In Galatians 2:20, Paul states, 'I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me and gave himself for me.' This passage illustrates that true life and salvation are found in Christ alone. Faith is not merely a mental ascent but a trust in the total work of Jesus as our Savior and Substitute—His perfect obedience fulfills the law we cannot keep, and His sacrifice atones for our sins. Therefore, believers rest assured that their justification is secured through Christ's faithfulness and righteousness, not their own.