How do we know Christ's faith saves us?

The assurance of our salvation rests on the faith of Christ, which serves as the sole basis for our justification. Paul emphasizes in Galatians 2:21 that if righteousness could be achieved through the law, then Christ's sacrifice would have been in vain. The faith of Jesus is the means by which God justifies His people, leading them to believe and rest in His finished work. This understanding aligns with historic Reformed theology, which upholds that salvation is entirely the work of God, highlighting Christ's role in our redemption as our substitute and surety.