6 But “Mary,” the other sister of Lazarus, “took a pound of ointment of pure nard, very precious, and anointed the feet of Jesus, and wiped His feet with her hair; and the house was filled with the odor of the ointment.” Such was the incident, let us look into the mystery it imported. Whatever soul of you wishes to be truly faithful, anoint like Mary the feet of the Lord with precious ointment. That ointment was righteousness, and therefore it was [exactly] a pound weight: but it was ointment of pure nard [nardi pistici], very precious. From his calling it “pistici,” we ought to infer that there was some locality from which it derived its preciousness: but this does not exhaust its meaning, and it harmonizes well with a sacramental symbol. The root of the word [“pure”] in the Greek is by us called “faith.” You were seeking to work righteousness: the just shall live by faith. Anoint the feet of Jesus: follow by a good life the Lord's footsteps. Wipe them with your hair: what you have of superfluity, give to the poor, and you have wiped the feet of the Lord; for the hair seems to be the superfluous part of the body. You have something to spare of your abundance: it is superfluous to you, but necessary for the feet of the Lord. Perhaps on this earth the Lord's feet are still in need. For of whom but of His members is He yet to say in the end, “Inasmuch as you did it to one of the least of mine, you did it unto me”? You spent what was superfluous for yourselves, but you have done what was grateful to my feet.
7. “And the house was filled with the odor.” The world is filled with the fame of a good character: for a good character is as a pleasant odor. Those who live wickedly and bear the name of Christians, do injury to Christ: of such it is said, that through them “the name of the Lord is blasphemed.” If through such God's name is blasphemed, through the good the name of the Lord is honored. Listen to the apostle, when he says, “We are a sweet savor of Christ in every place.” As it is said also in the Song of Songs, “Your name is as ointment poured forth.” Attend again to the apostle: “We are a sweet savor,” he says, “of Christ in every place, both in them that are saved, and in them that perish. To the one we are the savor of life unto life, to the other the savor of death unto death: and who is sufficient for these things?” The lesson of the holy Gospel before us affords us the opportunity of so speaking of that savor, that we on our part may give worthy utterance, and you diligent heed, to what is thus expressed by the apostle himself, “And who is sufficient for these things?” But have we any reason to infer from these words that we are qualified to attempt speaking on such a subject, or you to hear? We, indeed, are not so; but He is sufficient, who is pleased to speak by us what it may be for your profit to hear. The apostle, you see, is, as he calls himself, “a sweet savor:” but that sweet savor is “to some the savor of life unto life, and to others the savor of death unto death;” and yet all the while “a sweet savor” in itself. For he does not say, does he, To some we are a sweet savor unto life, to others an evil savor unto death? He called himself a sweet savor, not an evil; and represented himself as the same sweet savor, to some unto life, to others unto death. Happy they who find life in this sweet savor! But what misery can be greater than theirs, to whom the sweet savor is the messenger of death?
Source: Tractates on the Gospel of John (New Advent)