After the 'Theologian of the Holy Spirit,' John Calvin (1509-64), his views were enshrined especially in the 1647 Westminster Confession of the British Puritans.
The Spirit-drenched Westminster Confession of Faith (2:1) insists that "there is but one only living and true God, Who is infinite in being and perfection, a most pure Spirit." Nevertheless, "in the unity of the Godhead, there be three Persons — of one substance, power and eternity." They are: "God the Father, God the Son, and God the Holy Ghost." Each is distinct from the Other Two, yet Each also co-operates harmoniously with the Others — "the Holy Ghost eternally proceeding from the Father and the Son." W.C.F. 2:3.