4. He, therefore, being the perfect Father’s perfect Son, the Only-begotten Offspring of the unbegotten God, who has received all from Him Who possesses all, being God from God, Spirit from Spirit, Light from Light, says boldly, The Father in Me, and I in the Father130    St. John x. 38.. For as the Father is Spirit, so is the Son Spirit; as the Father is God, so is the Son God; as the Father is Light, so is the Son Light. Thus those properties which are in the Father are the source of those wherewith the Son is endowed; that is, He is wholly Son of Him Who is wholly Father; not imported from without, for before the Son nothing was; not made from nothing, for the Son is from God; not a son partially, for the fulness of the Godhead is in the Son; not a Son in some respects, but in all; a Son according to the will of Him who had the power, after a manner which He only knows. What is in the Father is in the Son also; what is in the Unbegotten is in the Only-begotten also. The One is from the Other, and they Two are a Unity; not Two made One, yet One in the Other, for that which is in Both is the same. The Father is in the Son, for the Son is from Him; the Son is in the Father, because the Father is His sole Origin; the Only-begotten is in the Unbegotten, because He is the Only-begotten from the Unbegotten. Thus mutually Each is in the Other, for as all is perfect in the Unbegotten Father, so all is perfect in the Only-begotten Son. This is the Unity which is in Son and Father, this the power, this the love; our hope, and faith, and truth, and way, and life is not to dispute the Father’s powers or to depreciate the Son, but to reverence the mystery and majesty of His birth; to set the unbegotten Father above all rivalry, and count the Only-begotten Son as His equal in eternity and might, confessing concerning God the Son that He is from God.

4. Qua ratione sit in Patre.---Igitur perfecti patris perfectus filius, et ingeniti Dei unigenita progenies, qui ab eo qui habet omnia accepit omnia, Deus a Deo, spiritus a spiritu, lumen a lumine, confidenter ait: Pater in me, et ego in Patre (Joan. X, 38): quia ut spiritus Pater, ita et Filius Spiritus; ut Deus Pater, ita et Filius Deus; ut lumen Pater, ita et Filius 0077C lumen. Ex iis ergo, quae in Patre, sunt ea in quibus est Filius, id est, ex toto Patre totus Filius natus est; non aliunde, quia nihil ante quam Filius; non ex nihilo, quia ex Deo Filius; non in parte, quia plenitudo deitatis in filio; neque in aliquibus, quia in omnibus: sed ut voluit qui potuit, 0078A ut scit qui genuit. Quod in Patre est, hoc et in Filio est; quod in ingenito, hoc et in unigenito; alter ab altero, et uterque unum; non duo unus, sed alius in alio, quia non aliud in 52 utroque; Pater in Filio, quia ex eo Filius; Filius in Patre, quia non aliunde quod Filius; unigenitus in ingenito, quia ab ingenito unigenitus. Ita in se invicem; quia ut omnia in ingenito patre perfecta sunt, ita omnia in filio unigenito perfecta sunt. Haec in Filio et Patre unitas, haec virtus, haec charitas, haec spes, haec fides, haec veritas, via, vita, non calumniari de virtutibus suis Deo, nec per secretum ac potestatem nativitatis obtrectare Filio; Patri ingenito nihil comparare, Unigenitum ab eo nec tempore nec virtute discernere, Deum filium quia ex Deo est confiteri.