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Roman Catechism
“His Only Son”
In these words, mysteries more exalted with regard to Jesus are proposed to the faithful as objects of their belief and contemplation; namely, that He is the Son of God, and true God, like the Father who begot Him from eternity. We also confess that He is the Second Person of the Blessed Trinity, equal in all things to the Father and the Holy Ghost; for in the Divine Persons nothing unequal or unlike should exist, or even be imagined to exist, since we acknowledge the essence, will and power of all to be one. This truth is both clearly revealed in many passages of Holy Scripture and sublimely announced in the testimony of St. John: In the beginning was the Word, and the Word was with God, and the Word was God.16
But when we are told that Jesus is the Son of God, we are not to understand anything earthly or mortal in His birth; but are firmly to believe and piously to adore that birth by which, from all eternity, the Father begot the Son, a mystery which reason cannot fully conceive or comprehend, and at the contemplation of which, overwhelmed, as it were, with admiration, we should exclaim with the Prophet: Who shall declare his generation?17 On this point, then, we are to believe that the Son is of the same nature, of the same power and wisdom, with the Father, as we more fully profess in these words of the Nicene Creed: And in one Lord Jesus Christ, his Only-begotten Son, born of the Father before all ages, God of God, light of light, true God of true God, begotten, not made, consubstantial to the Father, by whom all things were made.
Among the different comparisons employed to elucidate the mode and manner of this eternal generation, that which is borrowed from the production of thought in our mind seems to come nearest to its illustration, and hence St. John calls the Son the Word. For as our mind, in some sort understanding itself, forms an image of itself, which theologians express by the term word, so God, as far as we may compare human things to divine, understanding Himself, begets the eternal Word. It is better, however, to contemplate what faith proposes, and in the sincerity of our souls to believe and confess that Jesus Christ is true God and true Man—as God, begotten of the Father before all ages, as Man, born in time of Mary, His Virgin Mother.
While we thus acknowledge His twofold Nativity; we believe Him to be one Son, because His divine and human natures meet in one Person. As to His divine generation He has no brethren or coheirs, being the Only-begotten Son of the Father, while we mortals are the work of His hands. But if we consider His birth as man, He not only calls many by the name of brethren, but treats them as such, since He admits them to share with Him the glory of His paternal inheritance. They are those who by faith have received Christ the Lord, and who really, and by works of charity, show forth the faith which they profess in words. Hence the Apostle calls Christ, the first-born amongst many brethren.18
16. John 1:1
17. Isa 53:8
18. Rom 8:29