"This is the one grace of illumination, that our characters are not the same as before our washing. And since knowledge springs up with illumination, shedding its beams around the mind, the moment we hear, we who were untaught become disciples. Does this, I ask, take place on the advent of this instruction? You cannot tell the time. For instruction leads to faith, and faith with baptism is trained by the Holy Spirit."Clement
Instructor Ch. VI, Vol. 2

"And when it remains that the catechumen is to be baptized, let him learn what concerns the renunciation of the devil, and the joining himself with Christ; for it is fit that he should first abstain from things contrary, and then be admitted to the mysteries. He must beforehand purify his heart from all wickedness of disposition, from all spot and wrinkle, and then partake of the holy things"Constitutions of the Apostles
Bk. 7 Pt. 2 Ch. XL, Vol. 7

I will also relate the manner in which we dedicated ourselves to God when we had been made new through Christ; lest, if we omit this, we seem to be unfair in the explanation we are making. As many as are persuaded and believe that what we teach and say is true, and undertake to be able to live accordingly, are instructed to pray and to entreat God with fasting, for the remission of their sins that are past, we praying and fasting with them. Then they are brought by us where there is water, and are regenerated in the same manner in which we were ourselves regenerated. For, in the name of God, the Father and Lord of the universe, and of our Savior Jesus Christ, and of the Holy Spirit, they then receive the washing with water. For Christ also said, “Except ye be born again, ye shall not enter into the kingdom of heaven. (Joh_3:5)Justin Martyr
First Apology Ch. LXI, Vol. 1

“They were obliged,” he answered, “to ascend through water in order that they might be made alive; for, unless they laid aside the deadness of their life, they could not in any other way enter into the kingdom of God. Accordingly, those also who fell asleep received the seal of the Son of God. For,” he continued, “before a man bears the name of the Son of God he is dead; but when he receives the seal he lays aside his deadness, and obtains life. The seal, then, is the water: they descend into the water dead, and they arise alive. And to them, accordingly, was this seal preachedHermas
The Shepard Bk. 3 Pt. 3 Ch. XVI, Vol. 2

Apostle Paul says: “For he who hath not the Spirit of Christ is none of His.” (Rom_8:9) “And where the Spirit of the Lord is, there is liberty.” (2Co_3:17) He it is who effects with water the second birth as a certain seed of divine generation, and a consecration of a heavenly nativity, the pledge of a promised inheritance, and as it were a kind of handwriting of eternal salvation; who can make us God’s temple, and fit us for His houseNovation
Trinity Treatise Ch. XXIX, Vol. 5

"Let him, therefore, who is to be taught the truth regarding piety be instructed before his baptism in the knowledge of the unbegotten God, in the understanding of His only begotten Son, in the assured acknowledgment of the Holy Ghost. Let him learn the order of the several parts of the creation, the series of providence, the different dispensations of Thy laws."Constitution of the Apostles
Bk. 7 Pt. 2 Ch. XXXIX, Vol. 7

And this washing is called illumination, because they who learn these things are illuminated in their understandings. And in the name of Jesus Christ, who was crucified under Pontius Pilate, and in the name of the Holy Ghost, who through the prophets foretold all things about Jesus, he who is illuminated is washed.Justin Martyr
First Apology Ch. LXI, Vol. 1

On the fifth day the living creatures which proceed from the waters were produced, through: which also is revealed the manifold wisdom of God in these things; for who could count their multitude and very various kinds? Moreover, the things proceeding from the waters were blessed by God, that this also might be a sign of men’s being destined to receive repentance and remission of sins, through the water and laver of regeneration, — as many as come to the truth, and are born again, and receive blessing from God.Theophilus
To Autolycus Ch. XVI, Vol. 2

But He is perfected by the washing - of baptism - alone, and is sanctified by the descent of the Spirit? Such is the case. The same also takes place in our case, whose exemplar Christ became. Being baptized, we are illuminated; illuminated, we become sons; being made sons, we are made perfect; being made perfect, we are made immortal. “I,” says He, “have said that ye are gods, and all sons of the Highest.” (Psa_82:6) This work is variously called grace, and illumination, and perfection, and washing: washing, by which we cleanse away our sins; grace, by which the penalties accruing to transgressions are remitted; and illumination, by which that holy light of salvation is beheld, that is, by which we see God clearly. Now we call that perfect which wants nothing.Clement
Instructor Bk. 1 Ch. VI, Vol. 2

Apostle Paul says: “For he who hath not the Spirit of Christ is none of His.” (Rom_8:9) “And where the Spirit of the Lord is, there is liberty.” (2Co_3:17) He it is who effects with water the second birth as a certain seed of divine generation, and a consecration of a heavenly nativity, the pledge of a promised inheritance, and as it were a kind of handwriting of eternal salvation; who can make us God’s temple, and fit us for His houseNovation
Trinity Treatise Ch. XXIX, Vol. 5