For you have not received the spirit of bondage again to fear; but you have received the Spirit of adoption, by which we cry, Abba, Father.
All Commentaries on Romans 8:15 Go To Romans 8
Augustine of Hippo
AD 430
The fear of slaves, although it renders belief to the Master, contains no love of righteousness but only the fear of damnation. The cry of sons is “Abba, Father!”—two words, one of which belongs to the circumcision and the other to the uncircumcision.