Origen’s doctrine of the “eternal generation of the Son” was of primary importance in all subsequent discussions on the Trinity. Let no one imagine that we mean anything unsubstantial when we call Him the Wisdom of God; or suppose, for example, that we understand Him to be, not a living being endowed with wisdom, but something which makes men wise, giving itself to, and implanting itself in, the minds of those who are made capable of receiving its virtues and intelligence. If, then, it is once rightly understood that the only begotten Son of God is His Wisdom hypostatically [substantialiter] existing, I know not whether our mind ought to advance beyond this or entertain any suspicion that the hypostasis or substantia contains anything of a bodily nature, since everything corporeal is distinguished either by form, or color, or magnitude. And who in his sound senses ever sought for form, or color, or size, in wisdom, in respect of its being wisdom? And who that is capable of entertaining reverential thoughts or feelings regarding God can suppose or believe that God the Father ever existed, even for a moment of time, without having generated this Wisdom? For in that case he must say either that God was unable to generate Wisdom before He produced her, so that He afterward called into being that which formerly did not exist, or that He could, but—what is impious to say of God—was unwilling to generate; both of which suppositions, it is patent to all, are alike absurd and impious: for they amount to this, either that God advanced from a condition of inability to one of ability, or that, although possessed of the power, He concealed it, and delayed the generation of Wisdom. Therefore we have always held that God is the Father of His only begotten Son, who was born indeed of Him, and derives from Him, what He is, but without any beginning, not only such as may be measured by any divisions of time, but even that which the mind alone contemplates within itself, or beholds, so to speak, with the naked soul and understanding. And therefore we must believe that Wisdom was generated before any beginning that can be either comprehended or expressed. (_e_) Origen, _De Principiis_, I, 2:10. (MSG, 11:138.) Origen’s doctrine of “eternal creation” was based upon reasoning similar to that employed to show the eternal generation of the Son, but it was rejected by the Church, and figures among the heresies known as Origenism. See below, §§ 87, 93.