21 What a comfort to the guilty, when, stung with remorse and repenting of his sins, he hears the word of the priest who says to him in God's name: "I absolve thee from thy sins!" These words fall, it is true, from the lips of one who, in his turn, must needs beg the same absolution from another priest. This does not debase the merciful gift; but makes it, rather, appear greater; since beyond the weak creature is seen more clearly the hand of God through whose power is wrought this wonder. As an illustrious layman has written, treating with rare competence of spiritual things: ". . . when a priest, groaning in spirit at his own unworthiness and at the loftiness of his office, places his consecrated hands upon our heads; when, humiliated at finding himself the dispenser of the Blood of the Covenant; each time amazed as he pronounces the words that give life; when a sinner has absolved a sinner; we, who rise from our knees before him, feel we have done nothing debasing. . . We have been at the feet of a man who represented Jesus Christ, . . . we have been there to receive the dignity of free men and of sons of God."
Source: Ad Catholici Sacerdotii (Vatican.va)