2 Kings 5:10

But in addition, that we may accept the interpretation of the Jordan, that river that is so fresh and grants so much grace, it is useful to present both Naaman the Syrian, who was cleansed from leprosy, and the comments made about the rivers by the enemies of religion. It is written of Naaman, therefore: "He came with his horse and chariot and stood at the doors of the house of Elisha. And Elisha sent a messenger to him, saying, 'Go and wash seven times in the Jordan, and your flesh will return to you, and you will be cleansed.' " Then Naaman becomes angry because he does not perceive that it is our Jordan, and not the prophet, that removes the uncleanness of those who are unclean because of leprosy and heals them. For the work of a prophet is to send one to that which heals. Since, therefore, Naaman does not understand the great mystery of the Jordan, he says, "Behold, I said that he will assuredly come out to me and will stand and call on the name of the Lord his God and will place his hand on the place and the leprosy will recover," for placing the hand on leprosy and cleansing it was the work of my Lord Jesus alone. To the man who asked with faith, "If you will, you can make me clean, he not only said "I will, be made clean," but in addition to the word that he spoke, he also touched him, and he was cleansed from leprosy.

Let us further see what blessed Elisha commanded Naaman the Syrian. "Go," he says, "and wash seven times in the Jordan." When Naaman heard that he was to wash seven times in the Jordan, he was indignant and did not want to comply, but accepting the advice of his friends, he consented to be washed and was cleansed. This signified that before Christ was crucified, the Gentiles did not believe in Christ when he spoke in his own person, but afterwards they devoutly came to the sacrament of baptism after the preaching of the apostles. For this reason Elisha told Naaman to wash seven times in the Jordan. See, brothers: Elisha sent Naaman to the river Jordan because Christ was to send the Gentiles to baptism. Moreover, the fact that Elisha did not touch Naaman himself or baptize him showed that Christ did not come to the Gentiles himself but through his apostles to whom he said, "Go, and baptize all nations in the name of the Father, and of the Son and of the Holy Spirit." Notice further that Naaman, who prefigured the Gentiles, recovered his health in the same river that later Christ consecrated by his baptism. However, when Naaman heard that he was to wash seven times in the Jordan, he became angry and said, "Are not the waters of my region better, the rivers of Damascus, the Abana and the Pharphar, that I may wash in them and be made clean?" When he had said this, his servants advised him to agree to the counsel of the prophet. Carefully notice what this means, brothers.Holy Elisha, as we said, typified our Lord and Savior, while Naaman prefigured the Gentiles. The fact that Naaman believed he would recover his health as the result of his own rivers indicates that the human race presumed on its free will and its own merits; but without the grace of Christ their own merits cannot possess health, although they can have leprosy. For this reason if the human race had not followed the example of Naaman and listened to the advice of Elisha, with humility receiving the gift of baptism through the grace of Christ, they could not be freed from the leprosy of the original and actual sins. "Wash seven times," he said, because of the sevenfold grace of the Holy Spirit, which reposed in Christ our Lord. Moreover, when our Lord was baptized in this river, the Holy Spirit came on him in the form of a dove. When Naaman descended into the river as a figure of baptism, "his…