6 Let me now fulfil the promise I made a little while ago and with all the skill of a rhetorician sing the praises of water and of baptism. In the beginning the earth was without form and void, there was no dazzling sun or pale moon, there were no glittering stars. There was nothing but matter inorganic and invisible, and even this was lost in abysmal depths and shrouded in a distorting gloom. The Spirit of God above moved, as a charioteer, over the face of the waters, and produced from them the infant world, a type of the Christian child that is drawn from the laver of baptism.
A firmament is constructed between heaven and earth, and to this is allotted the name heaven,— in the Hebrew Shamayim or 'what comes out of the waters,'— and the waters which are above the heavens are parted from the others to the praise of God. Wherefore also in the vision of the prophet Ezekiel there is seen above the cherubim a crystal stretched forth, that is, the compressed and denser waters. The first living beings come out of the waters; and believers soar out of the laver with wings to heaven.
Man is formed out of clay and God holds the mystic waters in the hollow of his hand. In Eden a garden is planted, and a fountain in the midst of it parts into four heads. This is the same fountain which Ezekiel later on describes as issuing out of the temple and flowing towards the rising of the sun, until it heals the bitter waters and quickens those that are dead. When the world falls into sin nothing but a flood of waters can cleanse it again. But as soon as the foul bird of wickedness is driven away, the dove of the Holy Spirit comes to Noah as it came afterwards to Christ in the Jordan, and, carrying in its beak a branch betokening restoration and light, brings tidings of peace to the whole world.
Pharaoh and his host, loth to allow God's people to leave Egypt, are overwhelmed in the Red Sea figuring thereby our baptism. His destruction is thus described in the book of Psalms: “You endowed the sea with virtue through your power: you broke the heads of the dragons in the waters: you broke the heads of leviathan in pieces.” For this reason adders and scorpions haunt dry places and whenever they come near water behave as if rabid or insane. As wood sweetens Marah so that seventy palm-trees are watered by its streams, so the cross makes the waters of the law lifegiving to the seventy who are Christ's apostles. It is Abraham and Isaac who dig wells, the Philistines who try to prevent them. Beersheba too, the city of the oath, and [Gihon], the scene of Solomon's coronation, derive their names from springs.
It is beside a well that Eliezer finds Rebekah. Rachel too is a drawer of water and wins a kiss thereby from the supplanter Jacob. When the daughters of the priests of Midian are in a strait to reach the well, Moses opens a way for them and delivers them from outrage. The Lord's forerunner at Salem (a name which means peace or perfection) makes ready the people for Christ with spring-water. The Saviour Himself does not preach the kingdom of heaven until by His baptismal immersion He has cleansed the Jordan. Water is the matter of His first miracle and it is from a well that the Samaritan woman is bidden to slake her thirst. To Nicodemus He secretly says:— “Unless a man be born of water and of the Spirit, he cannot enter into the Kingdom of God.” As His earthly course began with water, so it ended with it.
His side is pierced by the spear, and blood and water flow forth, twin emblems of baptism and of martyrdom. After His resurrection also, when sending His apostles to the Gentiles, He commands them to baptize these in the mystery of the Trinity. The Jewish people repenting of their misdoing are sent immediately by Peter to be baptized. Before Sion travails she brings forth children, and a nation is born at once. Paul the persecutor of the church, that ravening wolf out of Benjamin, bows his head before Ananias one of Christ's sheep, and only recovers his sight when he applies the remedy of baptism. By the reading of the prophet the eunuch of Candace the queen of Ethiopia is made ready for the baptism of Christ. Though it is against nature the Ethiopian does change his skin and the leopard his spots. Those who have received only John's baptism and have no knowledge of the Holy Spirit are baptized again, lest any should suppose that water unsanctified thereby could suffice for the salvation of either Jew or Gentile. “The voice of the Lord is upon the waters...The Lord is upon many waters...the Lord makes the flood to inhabit it.” His “teeth are like a flock of sheep that are even shorn which came up from the washing; whereof everyone bear twins, and none is barren among them.” If none is barren among them, all of them must have udders filled with milk and be able to say with the apostle: “You are my little children, of whom I travail in birth again until Christ be formed in you;” and “I have fed you with milk and not with meat.” And it is to the grace of baptism that the prophecy of Micah refers: “He will turn again, he will have compassion upon us: he will subdue our iniquities, and will cast all our sins into the depths of the sea.”
Source: Letters (New Advent)