1. Slaves of the one you obey (15-16)

Does being set free from the law give us license to sin? No. We must not try to fool ourselves. We are slaves of whomever we obey. When I yield to my sinful desires and do something just because of the dictates of my sinful nature, this is not freedom; it is slavery. 'My own man' mentality is appealing, but it is not possible for one to be his own man. Everyone belongs either to God or to Satan. Obedience does not come naturally. Even Jesus had to learn obedience (Heb 5:8). To obey God a decision of faith is necessary.

2. Obey God with your whole heart (17-18)

Jesus has set us free from our slavery to sin so that we can joyfully and wholeheartedly obey God. God doesn't want superficial, legalistic obedience like that of the elder brother in Jesus' parable (Lk 15:11-32). He wants us to obey his gospel with all our hearts. He wants us to live like beloved children, not like grudging, gloomy slaves. The word 'wholehearted' means 'with one's whole heart.'

Application: Lord, I love you. Let your love and joy fill my heart so that I can obey your word wholeheartedly.
One Word: Obedience from the heart