The Eternal Generation of the Son, as stated by a representative theologian, is defined as: “an eternal personal act of the Father, wherein, by necessity of nature, not by choice of will, He generates the person (not the essence) of the Son, by communicating to Him the whole indivisible substance of the Godhead, without division, alienation, or change, so that the Son is the express image of His Father’s person, and eternally continues, not from the Father, but in the Father, and the Father in the Son” (Dr. A. A. Hodge, Outlines of Theology, p. 182).The following Scripture verses are commonly given as the principal support of this doctrine: “For as the Father hath life in Himself, even so gave He to the Son also to have life in Himself” (John 5:26); “Believe me that I am in the Father, and the Father in me” (John 14:11); “Even as thou, Father, art in me, and I in thee” (John 17:21); “That ye may know and understand that the Father is in me, and I in the Father” (John 10:38); Christ is declared to be “the effulgence of his glory, and the very image of his substance” (Heb. 1:3); “For God so loved the world, that He gave His only begotten Son, that whosoever believeth on Him should not perish, but have eternal life” (John 3:16).
The present writer feels constrained to say, however, that in his opinion the verses quoted do not teach the doctrine in question. He feels that the primary purpose of these and similar verses is to teach that Christ is intimately associated with the Father, that He is equal with the Father in power and glory, that He is, in fact, full Deity, rather than to teach that His Person is generated by or originates in an eternal process which is going on within the Godhead. Even though the attempt is made to safeguard the essential equality of the Son by saying that the process by which the Son is generated is eternal and necessary, he does not feel that the attempt is successful. If, as even Augustine, for instance, asserts, the Father is the Fons Trinitatis – the fountain or source of the Trinity – from whom both the Son and the Spirit are derived, it seems that in spite of all else we may say we have made the Son and the Spirit dependent upon another as their principal cause, and have destroyed the true and essential equality between the Persons of the Trinity. As we have stated before, when the Scriptures tell us that one Person within the Trinity is known as the “Father,” and another as the “Son,” they intend to teach, not that the Son is originated by the Father, nor that the Father existed prior to the Son, but that they are the same in nature.
This, apparently, was also the position held by Calvin, for at the conclusion of his chapter on the Trinity, he says:
“But, studying the edification of the Church, I have thought it better not to touch upon many things, which would be unnecessarily burdensome to the reader, without yielding him any profit. For to what purpose is it to dispute, whether the Father is always begetting? For it is foolish to imagine a continual act of generation, since it is evident that three Persons have subsisted in God from all eternity” (Institutes, Book I, Chapter 13).