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Roman Catechism
“By the Holy Ghost”
As an explanation of the words in which this Article is expressed is not to be omitted, the pastor should teach that when we say that the Son of God was conceived by the power of the Holy Ghost, we do not mean that this Person alone of the Holy Trinity accomplished the mystery of the Incarnation. Although the Son only assumed human nature, yet all the Persons of the Trinity, the Father, the Son, and the Holy Ghost, were authors of this mystery.
It is a principle of Christian faith that whatever God does outside Himself in creation is common to the Three Persons, and that one neither does more than, nor acts without another. But that one emanates from another, this only cannot be common to all; for the Son is begotten of the Father only, and the Holy Ghost proceeds from the Father and the Son. Anything, however, which proceeds from them extrinsically is the work of the Three Persons without difference of any sort, and of this latter description is the Incarnation of the Son of God.
Of those things, nevertheless, that are common to all, the Sacred Scriptures often attribute some to one person, some to another. Thus, to the Father they attribute power over all things; to the Son, wisdom; to the Holy Ghost, love. Hence, as the mystery of the Incarnation manifests the singular and boundless love of God towards us, it is therefore in some sort peculiarly attributed to the Holy Ghost.
IN THE INCARNATION SOME THINGS WERE NATURAL, OTHERS SUPERNATURAL
In this mystery we perceive that some things were done which transcend the order of nature, some by the power of nature. Thus, in believing that the body of Christ was formed from the most pure blood of His Virgin Mother we acknowledge the operation of human nature, this being a law common to the formation of all human bodies, that they should be formed from the blood of the mother.
But what surpasses the order of nature and human comprehension is, that as soon as the Blessed Virgin assented to the announcement of the Angel in these words, Behold the handmaid of the Lord; be it done unto me according to thy word,4 the most sacred body of Christ was immediately formed, and to it was united a rational soul enjoying the use of reason; and thus in the same instant of time He was perfect God and perfect man. That this was the astonishing and admirable work of the Holy Ghost cannot be doubted; for according to the order of nature the rational soul is united to the body only after a certain lapse of time.
Again—and this should overwhelm us with astonishment—as soon as the soul of Christ was united to His body, the Divinity became united to both; and thus at the same time His body was formed and animated, and the Divinity united to body and soul.
Hence, at the same instant He was perfect God and perfect man, and the most Holy Virgin, having at the same moment conceived God and man, is truly and properly called Mother of God and man. This the Angel signified to her when he said: Behold thou shalt conceive in thy womb, and shalt bring forth a son; and thou shalt call his name Jesus. He shall be great, and shall be called the Son of the Most High.5 The event verified the prophecy of Isaias: Behold a virgin shall conceive, and bear a son.6 Elizabeth also declared the same truth when being filled with the Holy Ghost, she understood the Conception of the Son of God, and said: Whence is this to me, that the mother of my Lord should come to me?7
As the body of Christ was formed of the pure blood of the immaculate Virgin without the aid of man, as we have already said, and by the sole operation of the Holy Ghost, so also, at the moment of His Conception, His soul was enriched with an overflowing fullness of the Spirit of God, and a superabundance of all graces. For God gave not to Him, as to others adorned with holiness and grace, His Spirit by measure, as St. John testifies8 but poured into His soul the plenitude of all graces so abundantly that of his fullness we all have received.9
Although possessing that Spirit by which holy men attain the adoption of sons of God, He cannot, however, be called the adopted son of God; for since He is the Son of God by nature, the grace, or name of adoption, can on no account be deemed applicable to Him.
HOW TO PROFIT BY THE MYSTERY OF THE INCARNATION
These truths comprise the substance of what appears to demand explanation regarding the admirable mystery of the Conception. To reap from them abundant fruit for salvation the faithful should particularly recall, and frequently reflect, that it is God who assumed human flesh; that the manner in which He became man exceeds our comprehension, not to say our powers of expression; and finally, that He vouchsafed to become man in order that we men might be born again as children of God. When to these subjects they shall have given mature consideration, let them, in the humility of faith, believe and adore all the mysteries contained in this Article, and not indulge a curious inquisitiveness by investigating and scrutinising them—an attempt scarcely ever unattended with danger.
4. Luke 1:38
5. Luke 1:31-32
6. Is 7:14
7. Luke 7:14
8. Cf John 3:34
9. John 1:16