But our Lord Jesus Christ alone, "who knows no sin", "was defiled neither in father nor in mother" and "did not go out from the holy places". There were indeed some things to be set before the Jews in the passages above, to which they could not respond, but omitting those, what do they for the present tell us on this discourse, either they themselves or those who wish the law to be understood according to their sense: if these things are not referred to our high priest and Savior, how will it be proved according to the letter that "the great priest did not go out from the holy places", who nevertheless even took a wife, as is said below, "a virgin of his own kindred"? If "he does not go out from the holy places", if he goes forth nowhere, how or for what uses is he commanded to "take a wife"? For it must not be supposed that he could remain within the holy places with a wife. But let those suppose these things to whom "Jewish fables" are pleasing. But we have a "great priest" "after the order of Melchizedek", Christ Jesus, "never going out from the holy places"; for he is always in the holy places and remains always holy in his words, holy in his acts, holy in all his wishes, and he alone is the one who is never found outside the holy places. For he who sins "goes out from the holy places", and as many times as anyone sins, so many times is he made to be outside the holy places. But Christ, "who never sinned", "never went out from the holy places". But you too, who follow Christ and are his imitator, if you remain in the word of God, if "you meditate on his law day and night", if you are exercised in his commandments, you are always in the holy places and never depart from there. For the holy things are not to be sought in a place, but in acts and life and morals. If these are according to God and are held according to the precept of God, even if you are in your house, even if in the marketplace — and why do I say in the marketplace? — even if you be found in the theater serving the word of God, do not doubt that you are in the holy places. Or does it not seem to you that Paul, when he entered the theater or when he entered the "Areopagus" and preached Christ to the Athenians, was in the holy places? But also when he walked among the altars and idols of the Athenians, where he found written: "to the unknown God" and from this word took the beginning of his preaching of Christ, even there, "surveying" the "altars" of the gentiles, he was set in the holy places, because he was pondering holy things. But also whoever guards himself, after receiving the grace of God, lest he fall "into homicide, into adultery, into theft, into false testimony" and other things like these, but remains clean from every contagion of sin, this man "did not go out from the holy places", and did not defile the sanctification of his God in himself, because the holy "oil of anointing" of his God is upon him. That "oil" of which it is written in Exodus — how can it according to the letter properly be called the oil of God, which was compounded by the perfumer's art by an unguent-maker? But if you wish to see the oil of God, hear whom the prophet says to have been anointed with the oil of God, him without doubt of whom he says: "therefore God, your God, has anointed you with the oil of gladness above your fellows". This, then, is the "great priest" who alone was anointed with the oil of God and in whom the "oil of the anointing" of God remained always holy.
Source: HOMILIES ON LEVITICUS 12