For 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!" Paul contrasts two spirits: slavery and sonship. You have the Spirit of sonship, not of fear.
When accusation comes and says "Be afraid!" the Spirit in you answers: "Abba, Father!" You are a son, a daughter, not a slave. Fear and accusation belong to the old system. In sonship there is no place for them.