55. The insane frenzy of the heretics, and not any genuine difficulty, rendered it necessary that this should be written. For since the name of Holy Spirit has its own signification, and the Holy Spirit the Paraclete has the office and rank peculiar to His Person, and since the Father and the Son are everywhere declared to be immutable: how could the Holy Spirit be asserted to be a part either of the Father or of the Son? But since this folly is often affirmed amid other follies by godless men, it was needful that the pious should condemn it.

XXII. "If any man says that the Father and the Son and the Holy Spirit are three Gods: let him be anathema."