This monologue podcast episode of "Catechism in a Year" focuses on the Holy Spirit within the Trinity. Fr. Mike Schmitz begins by reviewing previous discussions on the Father and Son, then delves into the theological complexities surrounding the Holy Spirit's procession—from the Father alone or from both the Father and the Son (filioque). He explains the historical context of this debate, highlighting its role in the Great Schism of 1054 between the Eastern and Western Churches. The episode concludes with a call to prayer for the reunification of the Church, emphasizing that while the filioque clause remains a point of contention, there's potential for reconciliation based on shared understandings of the Trinity's mystery. A specific example is the conciliatory stance of Orthodox Bishop Callistus Ware, who suggests the differences are more semantic than doctrinal.