HippolytusContinued from here…

Give me now your best attention…, for I wish to go back to the fountain of life, and to view the fountain that gushes with healing.

The Father of immortality sent the immortal Son and Word into the world, who came to man in order to wash him with water and the Spirit.

And He, begetting us again to incorruption of soul and body, breathed into us the breath (spirit) of life, and endued us with an incorruptible panoply.

If, therefore, man has become immortal, he will also be God. And if he is made God by water and the Holy Spirit after the regeneration of the laver he is found to be also joint-heir with Christ after the resurrection from the dead.

Wherefore I preach to this effect…: Come into liberty from slavery, into a kingdom from tyranny, into incorruption from corruption.

And how…shall we come? How? By water and the Holy Ghost.

This is the water in conjunction with the Spirit, by which paradise is watered, by which the earth is enriched…, by which man is begotten again and endued with life, in which also Christ was baptized, and in which the Spirit descended in the form of a dove.

This is the Spirit that at the beginning “moved upon the face of the waters;” by whom the world moves; by whom creation consists, and all things have life; who also wrought mightily in the prophets, and descended in flight upon Christ.

This is the Spirit that was given to the apostles in the form of fiery tongues. This is the Spirit that David sought when he said, “Create in me a clean heart, O God, and renew a right spirit within me.”

Of this Spirit Gabriel also spoke to the Virgin, “The Holy Ghost shall come upon thee, and the power of the Highest shall overshadow thee.”

By this Spirit Peter spoke that blessed word, “Thou art the Christ, the Son of the living God.”

By this Spirit the rock of the Church was stablished. This is the Spirit, the Comforter, that is sent because of thee, that He may show thee to be the Son of God.

Come then, be begotten again, O man, into the adoption of God.

[…] He who comes down in faith to the laver of regeneration, and renounces the devil, and joins himself to Christ; who denies the enemy, and makes the confession that Christ is God; who puts off the bondage, and puts on the adoption,

—he comes up from the baptism brilliant as the sun, flashing forth the beams of righteousness, and, which is indeed the chief thing, he returns a son of God and joint-heir with Christ.

Hippolytus of Rome (c.170-c.236): Discourse on the Theophany, 8-10.