But God be thanked, that you were the servants of sin, but you have obeyed from the heart that form of doctrine which was delivered you.
All Commentaries on Romans 6:17 Go To Romans 6
John Chrysostom
AD 407
After shaming them by mentioning their slavery and alarming them by talking about its rewards, Paul puts the balance right by recalling the benefits which they have received. For by mentioning them he shows that they were set free from very great evils indeed and that this had happened without any labor on their part…. For no human power could have set us free from such great evils, but “thanks be to God,” who was willing and able to do such great things. And well he says that they were “obedient from the heart,” because they were neither forced nor pressed but came of their own accord, with a willing mind…. This shows that they exercised their free will.