Saint Cyril of Jerusalem on New Creation

Disciples of the New Testament and partakers of the mysteries of Christ, as yet by calling only, but ere long by grace also, make you a new heart and a new spirit (Ezek. 18:31), that there may be gladness among the inhabitants of heaven.

For if over one sinner that repenteth there is joy, according to the Gospel (Luke 15:7), how much more shall the salvation of so many souls move the inhabitants of heaven to gladness.

As ye have entered upon a good and most glorious path, run with reverence the race of godliness.

For the Only-begotten Son of God is present here most ready to redeem you, saying, Come unto Me all that labour and are heavy laden, and I will give you rest (Matt. 11:28).

Ye that are clothed with the rough garment of your offenses, who are holden with the cords of your own sins, hear the voice of the Prophet saying, Wash you, make you clean, put away your iniquities from before Mine eyes (Isaiah 1:16):  that the choir of Angels may chant over you, Blessed are they whose iniquities are forgiven, and whose sins are covered (Ps. 32:1).

Ye who have just lighted the torches of faith, guard them carefully in your hands unquenched; that He, who erewhile on this all-holy Golgotha opened Paradise to the robber on account of his faith, may grant to you to sing the bridal song.

If any here is a slave of sin, let him promptly prepare himself through faith for the new birth into freedom and adoption; and having put off the miserable bondage of his sins, and taken on him the most blessed bondage of the Lord, so may he be counted worthy to inherit the kingdom of heaven.

Put off, by confession, the old man, which waxeth corrupt after the lusts of deceit, that ye may put on the new man, which is renewed according to knowledge of Him that created him (Eph. 4:22; Col. 3:10).

Get you the earnest of the Holy Spirit (2 Cor. 1:22) through faith, that ye may be able to be received into the everlasting habitations (Luke 16:9).

Come for the mystical Seal, that ye may be easily recognised by the Master; be ye numbered among the holy and spiritual flock of Christ, to be set apart on His right hand, and inherit the life prepared for you.

For they to whom the rough garment of their sins still clings are found on the left hand, because they came not to the grace of God which is given through Christ at the new birth of Bapti
sm:  new birth I mean not of bodies, but the spiritual new birth of the soul.

Cyril of Jerusalem (c. 313-386): Catechetical Lectures 1, 1-2.