How do we know faith saves us?

The assurance that faith saves us is founded upon God's unchanging promises. In Romans 10:9-10, we see that confession with the mouth and belief in the heart lead to salvation, indicating how faith is a response to the revealed truth of God. The believer's assurance comes not from the strength of their faith but from the unwavering nature of Christ's work on our behalf. Christ’s blood, which cleanses us from all sin, is the true basis of our assurance and salvation, reaffirming that even when our faith seems weak or shaken, the efficacy of His sacrifice remains. Thus, true faith securely rests in the sufficiency of Christ's atonement.