Church Father's Writing: What church father's materials should I be reading? [Didache, Clement of Rome, Epistle of Barnabas, Shepherd of Hermas, Letter to Diognitus, Ignatius of Antioch, Justin Martyr]. The Holy Spirit (Having, Filled, Baptism): What is the difference between having the Holy Spirit and being baptized in the Holy Spirit? Are you filled once, or many times? [Acts 1:5, 2:4, 4, 8, 19, Ephesians 5].