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.
“Even though I walk through the valley of the shadow of death, I will fear no evil, for you are with me; your rod and your staff, they comfort me“ (Psalm 23:4). We too often talk about God, without talking to God. We can give mental assent to certain Bible teaching – Jesus is Lord, Jesus is a Shepherd, Jesus is awesome – but not say to Jesus, “Rule my life as my Lord, be my Shepherd, help me to walk in awe of you!”