Corpus of Latin Ecclesiastical Writers, Vol. LXII: Ambrose's Exposition of Psalm 118

praying and saying: Let him kiss me with the kiss of his mouth, for your breasts are better than wine. The flesh was already wanting to cleave to Christ, it was already hastening to enter into marriage, so that it might be one spirit and become the flesh of Christ, which was previously that of a harlot. "Let him kiss," she says, "me"—the Word of God kisses us when the Spirit of knowledge illuminates our mind—and as if despising all her own joys and delights, desiring to cleave to heavenly commandments, she says: "For the best precepts of your testaments are above all desire of the flesh and the pleasure of the world."

3. For she remembered that she had previously fallen in Eve, while preferring the pleasure of the body to heavenly commandments. "Your name is oil poured out," that is: this world was stinking, entirely unclean with the impurities of various crimes; now the sweetness of chastity breathes everywhere, the oil of faith, the flower of integrity. And from morals she comes to mystical things, saying: The king has brought me into his chamber. Let us exult and rejoice in you; let us love your breasts more than wine. For the kiss is simple, but the secret of the chamber is full of business.

6. In the Gospel itself, there is also a most beautiful passage concerning morals, that everyone should cleanse his own vessel, the Lord saying: Blind Pharisee, cleanse first what is inside the cup and the dish, so that what is outside may also become clean. For unless everyone cleanses himself within, even if he seems beautiful and just on the outside, he will be like whitened sepulchers, so that he may seem just on the outside, but inside he is foul.

The text references Song of Songs 1:2-4, 1 Corinthians 6:17, and Matthew 23:26-27.