Hebrews 5:10

Therefore, in this general and primordial law of God, the observance of which, in the case of the tree’s fruit, He had sanctioned, we recognise en closed all the precepts specially of the posterior Law, which germinated when dis closed at their proper times. For the subsequent superinduction of a law is the work of the same Being who had before premised a precept; since it is His province withal subsequently to train, who had before resolved to form, righteous creatures. For what wonder if He extends a discipline who institutes it? if He advances who begins? In short, before the Law of Moses, written in stone-tables, I contend that there was a law unwritten, which was habitually understood naturally, and by the fathers was habitually kept. …

Learn now (over and above the immediate question) the clue to your error. We affirm, two characters of the Christ demonstrated by the prophets, and as many advents of His forenoted: one, in humility (of course the first), when He has to be led “as a sheep for a victim; and, as a lamb voiceless before the shearer, so He opened not His mouth,” not even in His aspect comely. For “we have announced,” says the prophet , “concerning Him, (He is) as a little child, as a root in a thirsty land; and there was not in Him attractiveness or glory. …

“And was heard,” (he says), “in that He feared; though He were a Son , yet learned He obedience by the things which He suffered.” ( Ver. 9, 10 ), “And being made perfect He became the Author of eternal salvation unto all them that obey Him: called of God an High Priest after the order of Melchisedech.”

17. But this Melchizedec is introduced in the Holy Scriptures as a priest of the most high God, not consecrated by any anointing oil, especially prepared, and not even belonging by descent to the priesthood of the Jews. Wherefore after his order, but not after the order of the others, who received symbols and types, was our Saviour proclaimed, with an appeal to an oath, Christ and priest.

Against X. The unchangeable nature was not changed into nature of flesh, but assumed human nature and set it over the common high priests, as the blessed Paul teaches in the words, “For every high priest taken from among men is ordained for men in things pertaining to God, that he may offer both gifts and sacrifices for sins: who can have compassion on the ignorant and on them that are out of the way; for that he himself also is encompassed with infirmity. …

21. Christ Himself is a virgin; and His mother is also a virgin; yea, though she is His mother, she is a virgin still. For Jesus has entered in through the closed doors, and in His sepulchre, a new one hewn out of the hardest rock, no man is laid either before Him or after Him. Mary is “a garden enclosed…a fountain sealed,” and from that fountain flows, according to Joel, the river which waters the torrent bed either of cords or of thorns; of cords being those of the sins by which we were beforetime bound, the thorns those which choked the seed the goodman of the house had sown. She is the east gate, spoken of by the prophet Ezekiel, always shut and always shining, and either concealing or revealing the Holy of Holies; and through her “the Sun of Righteousness,” our “high priest after the order of Melchizedek,” goes in and out. …