The Treasures of The Fathers of the Church The Feast of Pentecost With great joy and enthusiasm we present to you a collection of patristic sermons on the Holy Feast of Pentecost. This work includes selections from festal sermons and commentaries by St. Athanasius the Apostolic, St. Gregory the Theologian, St. John Chrysostom, and many others. We hope this book will be an appetizer to a more in-depth study of patristic writings.... From the introduction by His Grace Bishop Serapion.