When the fullness of time had come, God sent forth his Son, born of woman, born under the law, to redeem those who were under the law, so that we might receive adoption as sons (Galatians 4:4-5).
You did not receive the spirit of slavery to fall back into fear, but you have received the Spirit of adoption as sons, by whom we cry, “Abba! Father!” (Romans 8:15). Paul is intent on telling Christians something the Spirit of God does do, and something the Spirit emphatically does not do. Paul insists the Spirit of God does not bring a slavish fear but rather an affectionate crying out to God as our Father.