How can I be sure I have faith in Christ?

Assurance of faith in Christ comes from understanding that genuine faith is not self-generated but is a result of being born of God. The sermon highlights that when one believes in Christ, it is evidence of God's grace at work in their life. Believers are encouraged to look not to their own performance or decision, but to the work of Christ and the assurance that He, through the Holy Spirit, has done what was necessary for their salvation. True faith reflects our reliance on Him and not on ourselves, supporting our assurance in Him.