Whereas the Old and New Testaments teach the divinity of the Holy Spirit, it took the early errors of anti-Spirit heretics for the Church to clarify and develop what is originally found throughout the Bible. Bishops and theologians like St. Irenaeus, Athanasius of Alexandria, Hilary of Poitiers, and St. Augustine prayed, pondered, and pored over what would become the Church's official language on the power and the presence of the Holy Spirit. With these Church Fathers, we today must recover the spiritual fruit of good theology, reflecting deeply on our own life stories before these great minds. Who is the Holy Spirit for you? What do you want the Holy Spirit to do for you and where do you still refuse his promptings? How do approach each person of the Trinity in prayer, worship, and day-to-day charity? These and other questions connect theological texts offering the do-it-at-home retreatant a fruitful and feasible way of growing in the holiness of God's own Spirit.