How do we know that justification comes through faith in Christ?

Justification is a central doctrine of Reformed theology, founded on the belief that our standing before God is based solely on Christ's righteousness, not our own works. In the sermon, it is highlighted that no one can achieve righteousness through their own efforts, resonating with the message of Ephesians 2:8-9, which states that we are saved by grace through faith, and that not of ourselves. This emphasizes that our justification is entirely an act of God's grace through Christ, who takes our sins upon Himself and gives us His righteousness.