The Holy Spirit is God, just as Jesus Christ is God. Both lead us to the Father, the very God of the Old Testament. Yet there is one God. One in essence, yet three persons: Father, Son, and Holy Spirit, the Holy Trinity. All three are eternal, transcendent and equal, yet the Father is pre-eminent. Orthodox believes the mystery of the Trinity is beyond the comprehension of finite human understanding.
Elder Porphyrios (+Monk Moses of the Holy Skete of St. Panteleimon, of Mt. Athos, writer) – ΑΓΙΟΣ ΠΟΡΦΥΡΙΟΣ ΚΑΥΣΟΚΑΛΥΒΙΤΗΣ
† Monk Moses of the Holy Mountain, talks about Saint Porphyrios the Kavsokalyvite