Hebrews 5:2

Gently too from this He casts down the things of the Law, alluding to former times. For that they may not run back to them and say, “We have the sacrifices which Moses commanded, they are able to deliver us,” He addeth these words, since otherwise what connection would the saying have? For “all have sinned, and come short of the glory of God, being justified freely by His grace” ( Rom. iii. 23, 24 ), even the priests themselves. Wherefore Paul also saith of the priest, that “he ought as for the people so also for himself to offer for sins, for that he also is compassed about with infirmity.” ( Heb. v. 3, 2 .) And this is signified by His saying, “The servant abideth not in the house.” Here also He showeth His equal honor with the Father, and the difference between slave and free. For the parable has this meaning, that is, “the servant hath no power,” this is the meaning of “abideth not.”

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. …

XVIII. I, however, for I confess myself to be a man, that is to say, an animal shifty and of a changeable nature, both eagerly receive this Baptism, and worship Him Who has given it me, and impart it to others; and by shewing mercy make provision for mercy. For I know that I too am compassed with infirmity, and that with what measure I mete it shall be measured to me again. But what sayest thou, O new Pharisee pure in title but not in intention, who dischargest upon us the sentiments of Novatus, though thou sharest the same infirmities? Wilt thou not give any place to weeping? Wilt thou shed no tear? Mayest thou not meet with a Judge like thyself? Art thou not ashamed by the mercy of Jesus, Who took our infirmities and bare our sicknesses; Who came not to call the righteous but sinners to repentance; Who will have mercy rather than sacrifice; who forgiveth sins till seventy times seven. …

48. And so He Himself also chose Aaron as priest, that not the will of man but the grace of God should have the chief part in the election of the priest; not the voluntary offering of himself, nor the taking it upon himself, but the vocation from heaven, that he should offer gifts for sins who could be touched for those who sinned, for He Himself, it is said, bears our weakness. No one ought to take this honour upon himself but they are called of God, as was Aaron, and so Christ did not demand but received the priesthood.