We are commanded to turn from our sinful disobedience to God and instead obey him by believing in and following the Lord Jesus Christ as our Savior. This is the way Paul himself preached the gospel, though we frequently overlook it because of our own weak methods. Do you remember how Paul concluded his great sermon to the Athenians? “In the past God overlooked such ignorance, but now he commands all people everywhere to repent. For he has set a day when he will judge the world with justice by the man he has appointed …” (Acts 17:30–31, italics mine). In God’s name, Paul commanded the Greeks to repent of their sin and turn to Jesus. It is the same in Romans. In Romans 6:17 Paul summarizes the response of the Roman Christians to the gospel by saying, “Thanks be to God that, though you used to be slaves to sin, you wholeheartedly obeyed the form of teaching to which you were entrusted” (italics mine, here and in the subsequent citations). In Romans 10 he argues that the Jews “did not...