"And it enjoined love to God, and taught just dealing towards our neighbor, that we should neither be unjust nor unworthy of God, who prepares man for His friendship through the medium of the Decalogue, and likewise for agreement with his neighbor, — matters which did certainly profit man himself; God, however, standing in no need of anything from man."Iranaeus
Against Heresies Bk. 4 Ch. XVI, Vol. 1

"And, “he who has looked upon a woman to lust after her, hath committed adultery with her already in his heart;” (Mat_5:28) and, “he that is angry with his brother without a cause, shall be in danger of the judgment.” (Mat_5:22) [All this is declared,] that we may know that we shall give account to God not of deeds only, as slaves, but even of words and thoughts, as those who have truly received the power of liberty, in which [condition] a man is more severely tested, whether he will reverence, and fear, and love the Lord. And for this reason, Peter says “that we have not liberty as a cloak of maliciousness,” (1Pe_2:16) but as the means of testing and evidencing faith."Iranaeus
Against Heresies Bk. 4 Ch. XVI, Vol. 1

That expression, also, in Ezekiel, when he says, “I will take away their stony hearts, and will give them hearts of flesh, that they may walk in My precepts, and keep My ways,” (Eze 11:19, Eze 11:20) may impress some, inasmuch as it seems to be a gift of God, either to walk in His ways or to keep His precepts, if He take away that stony heart which is an obstacle to the keeping of His commandments, and bestow and implant a better and more impressible heart, which is called now a heart of flesh. Consider also the nature of the answer given in the Gospel by our Lord and Savior to those who inquired of Him why He spoke to the multitude in parables. His words are: “That seeing they may not see; and hearing they may hear, and not understand; lest they should be converted3, and their sins be forgiven them.” (Mar 4:12)Origen
Origen- De Principiis Book III Ch. I, Vol. 4

"After this, let all rise up with one consent, and looking towards the east, after the catechumens and penitents are gone out, pray to God eastward, who ascended up to the heaven of heavens to the east; remembering also the ancient situation of paradise in the east, from whence the first man, when he had yielded to the persuasion of the serpent, and disobeyed the command of God, was expelled."Apostolic Constitution
Bk. 2 Pt. 3 Ch. LVII, Vol. 7

"They (the Jews) had therefore a law, a course of discipline, and a prophecy of future things. For God at the first, indeed, warning them by means of natural precepts, which from the beginning He had implanted in mankind, that is, by means of the Decalogue (which, if any one does not observe, he has no salvation), did then demand nothing more of them."Iranaeus
Against Heresies Bk. 4 Ch. XV Vol. 1

"For as the sea, if it had not had the influx and supply of the rivers and fountains to nourish it, would long since have been parched by reason of its saltiness; so also, the world, if it had not had the law of God and the prophets flowing and welling up sweetness, and compassion, and righteousness, and the doctrine of the holy commandments of God, would long ere now have come to ruin, by reason of the wickedness and sin which abound in it."Theophilus
To Autolycus Bk. 2 Ch. XIV Vol. 2

"With the greatest clearness, accordingly, the Word has spoken respecting Himself by Hosea: “I am your Instructor.” Now piety is instruction, being the learning of the service of God, and training in the knowledge of the truth, and right guidance which leads to heaven. And the word “instruction” is employed variously. For there is the instruction of him who is led and learns, and that of him who leads and teaches; and there is, thirdly, the guidance itself; and fourthly, what is taught, as the commandments enjoined."Clement
Instructor Bk. 1 Ch. VII, Vol. 2

"…and that He should execute just judgment towards all; that He may send “spiritual wickedness,” (Eph_6:12) and the angels who transgressed and became apostates, together with the ungodly, and unrighteous, and wicked, and profane among men, into everlasting fire; but may, in the exercise of His grace, confer immortality on the righteous, and holy, and those who have kept His commandments, and have persevered in His love, some from the beginning [of their Christian course], and others from [the date of] their repentance, and may surround them with everlasting glory."Iranaeus
Against Heresies Bk. 1 Ch. X, Vol. 1

"Preparing man for this life, the Lord Himself did speak in His own person to all alike the words of the Decalogue; and therefore, in like manner, do they remain permanently with us, receiving by means of His advent in the flesh, extension and increase, but not abrogation (to annul, do away with)."Iranaeus
Against Heresies Bk. 4 Ch. XVI, Vol. 1

"For the Lord speaks thus to Moses: “Moses go down quickly; for the people whom thou hast brought out of the land of Egypt have transgressed.” (Exo_32:7; Deu_9:12) And Moses understood [the meaning of God], and cast the two tables out of his hands; and their covenant was broken, in order that the covenant of the beloved Jesus might be sealed upon our heart, in the hope which flows from believing in Him."Barnabas
Epistle Part 1 Ch. IV, Vol. 1

"Why, then, did the Lord not form the covenant for the fathers? Because “the law was not established for righteous men.” (1Ti_1:9) But the righteous fathers had the meaning of the Decalogue written in their hearts and souls, that is, they loved the God who made them, and did no injury to their neighbor."Iranaeus
Against Heresies Bk. 4 Ch. XVI, Vol. 1

"Let us then aim at the fulfilment of the commandments by the works of the Lord; for the Word Himself also, having openly become flesh, (Joh_1:14) exhibited the same virtue, both practical and contemplative. Wherefore let us regard the Word as law, and His commands and counsels as the short and straight paths to immortality; for His precepts are full of persuasion, not of fear."Clement
Instructor Bk. 1 Ch. III Vol. 2

"But the imitation of those who have already been proved, and who have led correct lives, is most excellent for the understanding and practice of the commandments. “So that whosoever shall eat the bread and drink the cup of the Lord unworthily, shall be guilty of the body and blood of the Lord. But let a man examine himself, and so let him eat of the bread and drink of the cup.” (1Co_11:27, 1Co_11:28)"Clement
Stromata Bk. 1 Ch. 1, Vol. 2

"But we, after we have thus washed him who has been convinced and has assented to our teaching, bring him to the place where those who are called brethren are assembled, in order that we may offer hearty prayers in common for ourselves and for the baptized [illuminated] person, and for all others in every place, that we may be counted worthy, now that we have learned the truth, by our works also to be found good citizens and keepers of the commandments, so that we may be saved with an everlasting salvation."Justin Martyr
First Apology Ch. LXV, Vol. 1

"Adorned by a thoroughly virtuous and religious life, ye did all things in the fear of God. The commandments and ordinances of the Lord were written upon the tablets of your hearts. (Pro_7:3)"St. Clement (Disciple of Apostle Peter)
Corinthians Ch. 2 Vol. 1

Now, that the law did beforehand teach mankind the necessity of following Christ, He does Himself make manifest, when He replied as follows to him who asked Him what he should do that he might inherit eternal life: “If thou wilt enter into life, keep the commandments.” (Mat_19:17-18, etc.) But upon the other asking “Which?”” again the Lord replies: “Do not commit adultery, do not kill, do not steal, do not bear false witness, honor father and mother, and thou shalt love thy neighbor as thyself,” — setting as an ascending series (velut gradus) before those who wished to follow Him, the precepts of the law, as the entrance into life; and What He then said to one He said to all.Iranaeus
Against Heresies Bk. 4 Ch. XII, Vol. 1