Authentic Christianity believes in One God, who is Trinity: Father, and Son, and Holy Spirit. The Christian Trinity is a concept confused by many who can’t grasp the perplexity of God being three Hypostases, while One as Being and Essence. This book introduces the reader to some of the early church fathers’ writings on the Father, and Son, and Spirit, journeying towards understanding the Scripturally Orthodox view of the identity of the Son and Spirit in the writings of Gregory the Theologian (c. AD 390) and Cyril of Alexandria (c. AD 444). The ultimate objective is to begin perceiving proper Orthodox Christology and Pneumatology.