What is the meaning of these words "He was conceived by the Holy Ghost, born of the virgin Mary"?

That God's eternal Son, who is, and continues (a) true and eternal God, (b) took upon him the very nature of man, of the flesh and blood of the virgin Mary, (c) by the operation of the Holy Ghost; (d) that he might also be the true seed of David, (e) like unto his brethren in all things, (f) sin excepted. (g)

(a) Rom.1:4 And declared to be the Son of God with power, according to the spirit of holiness, by the resurrection from the dead: Rom.9:5 Whose are the fathers, and of whom as concerning the flesh Christ came, who is over all, God blessed for ever. Amen. (b) 1 John 5:20 And we know that the Son of God is come, and hath given us an understanding, that we may know him that is true, and we are in him that is true, even in his Son Jesus Christ. This is the true God, and eternal life. John 1:1 In the beginning was the Word, and the Word was with God, and the Word was God. John 17:3 And this is life eternal, that they might know thee the only true God, and Jesus Christ, whom thou hast sent. Rom.1:3 Concerning his Son Jesus Christ our Lord, which was made of the seed of David according to the flesh; Col.1:15 Who is the image of the invisible God, the firstborn of every creature: (c) Gal.4:4 But when the fulness of the time was come, God sent forth his Son, made of a woman, made under the law, Luke 1:31 And, behold, thou shalt conceive in thy womb, and bring forth a son, and shalt call his name JESUS. Luke 1:42 And she spake out with a loud voice, and said, Blessed art thou among women, and blessed is the fruit of thy womb. Luke 1:43 And whence is this to me, that the mother of my Lord should come to me? (d) John 1:14 And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth. Matt.1:18 Now the birth of Jesus Christ was on this wise: When as his mother Mary was espoused to Joseph, before they came together, she was found with child of the Holy Ghost. Matt.1:20 But while he thought on these things, behold, the angel of the Lord appeared unto him in a dream, saying, Joseph, thou son of David, fear not to take unto thee Mary thy wife: for that which is conceived in her is of the Holy Ghost. Luke 1:35 And the angel answered and said unto her, The Holy Ghost shall come upon thee, and the power of the Highest shall overshadow thee: therefore also that holy thing which shall be born of thee shall be called the Son of God. (e) Ps.132:11 The LORD hath sworn in truth unto David; he will not turn from it; Of the fruit of thy body will I set upon thy throne. Rom.1:3 Concerning his Son Jesus Christ our Lord, which was made of the seed of David according to the flesh; 2 Sam.7:12 And when thy days be fulfilled, and thou shalt sleep with thy fathers, I will set up thy seed after thee, which shall proceed out of thy bowels, and I will establish his kingdom. Luke 1:32 He shall be great, and shall be called the Son of the Highest: and the Lord God shall give unto him the throne of his father David: Acts 2:30 Therefore being a prophet, and knowing that God had sworn with an oath to him, that of the fruit of his loins, according to the flesh, he would raise up Christ to sit on his throne; (f) Philip.2:7 But made himself of no reputation, and took upon him the form of a servant, and was made in the likeness of men: Heb.2:14 Forasmuch then as the children are partakers of flesh and blood, he also himself likewise took part of the same; that through death he might destroy him that had the power of death, that is, the devil; Heb.2:17 Wherefore in all things it behoved him to be made like unto his brethren, that he might be a merciful and faithful high priest in things pertaining to God, to make reconciliation for the sins of the people. (g) Heb.4:15 For we have not an high priest which cannot be touched with the feeling of our infirmities; but was in all points tempted like as we are, yet without sin.