Testifying both to the Jews, and also to the Greeks, repentance toward God, and faith toward our Lord Jesus Christ. Acts 20:21
Paul taught:
1) Repentance- People had broke the Law of God by sinning
2) Faith in Christ- Christ is the one who redeems sinners from the penalty of the law
"The law is a mirror, into which we may look and discern the defects of our characters. There is no power in the law to save or to pardon the trangressor. What, then, does it do? It brings the sinner to Christ." 1888 Sermons p.42 E.G.W.