For the priestly office is indeed discharged on earth, but it ranks among heavenly ordinances; and very naturally so: for neither man, nor angel, nor archangel, nor any other created power, but the Paraclete Himself, instituted this vocation, and persuaded men while still abiding in the flesh to represent the ministry of angels. Wherefore the consecrated priest ought to be as pure as if he were standing in the heavens themselves in the midst of those powers. Fearful, indeed, and of most awful import, were the things which were used before the dispensation of grace, as the bells, the pomegranates, the stones on the breastplate and on the ephod, the girdle, the mitre, the long robe, the plate of gold, the holy of holies, the deep silence within. But if any one should examine the things which belong to the dispensation of grace, he will find that, small as they are, yet are they fearful and full of awe, and that what was spoken concerning the law is true in this case also, that "what has been made glorious has no glory in this respect by reason of the glory which excels." For when you see the Lord sacrificed, and laid upon the altar, and the priest standing and praying over the victim, and all the worshippers empurpled with that precious blood, can you then think that you are still among men, and standing upon the earth? Are you not, on the contrary, straightway translated to Heaven, and casting out every carnal thought from the soul, do you not with disembodied spirit and pure reason contemplate the things which are in Heaven?
[St. John Chrysostom, On the Priesthood, Book III.4. The quotation is from 2 Corinthians 3:10.]