6:17 thanks be to God. While Paul stresses the activity of the individual in conversion (“present yourselves,” v. 16; “obedient,” v. 17), he gratefully traces all right spiritual responses to the grace of God. While the individual is active in conversion, it is in a non-contributory and non-meritorious way, so that neither divine grace nor divine sovereignty is compromised.
the standard of teaching to which you were committed. The opposite of slavery to sin is commitment to the new life-style that grace produces. In view here are both the gospel itself and the kind of teaching given in chs. 12–16, perhaps with Christ Himself as the model (cf. Eph. 4:20, 21).