How do we know faith and repentance are true?

Faith and repentance are affirmed as true by their effects in a believer's life. According to Acts 5:31, God has exalted Jesus to give repentance and forgiveness of sins, highlighting that these are divine gifts, not human achievements. Furthermore, in Titus 3:5, we learn that it is not by our works but by His mercy that we are saved. The internal change that leads us from a reliance on self to complete trust in Christ's righteousness confirms the authenticity of our faith and repentance.