95 Since then I knew these things, and that no one is worthy of the mightiness of God, and the sacrifice, and priesthood, who has not first presented himself to God, a living, holy sacrifice, and set forth the reasonable, well-pleasing service, and sacrificed to God the sacrifice of praise and the contrite spirit, which is the only sacrifice required of us by the Giver of all; how could I dare to offer to Him the external sacrifice, the antitype of the great mysteries, or clothe myself with the garb and name of priest, before my hands had been consecrated by holy works; before my eyes had been accustomed to gaze safely upon created things, with wonder only for the Creator, and without injury to the creature; before my ear had been sufficiently opened to the instruction of the Lord, and He had opened mine ear to hear without heaviness, and had set a golden earring with precious sardius, that is, a wise man's word in an obedient ear; before my mouth had been opened to draw in the Spirit, and opened wide to be filled with the spirit of speaking mysteries and doctrines; and my lips bound, to use the words of wisdom, by divine knowledge, and, as I would add, loosed in due season: before my tongue had been filled with exultation, and become an instrument of Divine melody, awaking with glory, awaking right early, and laboring till it cleave to my jaws: before my feet had been set upon the rock, made like hart's feet, and my footsteps directed in a godly fashion so that they should not nearly slip, nor slip at all; before all my members had become instruments of righteousness, and all mortality had been put off, and swallowed up of life, and had yielded to the Spirit?
Source: Orations (New Advent)