The Son is the Eternal Word of God

This is He who was from the beginning, who appeared as if new, and was found old, and yet who is ever born afresh in the hearts of the saints. This is He who, being from everlasting, is today called the Son’ through whom the Church is enriched, and grace, widely spread, increases in the saints, furnishing understanding, revealing mysteries, announcing times, rejoicing over the faithful, giving to those that seek, by whom the limits of faith are not broken through, nor the boundaries set by the fathers passed over.

Mathetes
Epistle to Diognetus
Chapter XI

Jesus is our exchange

By what other one was it possible that we, the wicked and ungodly, could be justified, than by the only Son of God? O sweet exchange! O unsearchable operation! O benefits surpassing all expectation! That the wickedness of many should be hid in a single righteous One, and that the righteousness of One should justify many transgressors!

Mathetes
Epistle to Diognetus
Chapter IX

God manifested himself

…no man has either seen Him, or made Him known, but He has revealed Himself. And He has manifested Himself through faith, to which alone it is given to behold God. For God, the Lord and Fashioner of all things, who made all things, and assigned them their several positions, proved Himself not merely a friend of mankind, but also long-suffering in His dealings with them.

Mathetes
Epistle to Diognetus
Chapter VIII

Christ, the Creator of all, was Sent

For, as I said, this was no mere earthly invention which was delivered to them, nor is it a mere human system of opinion, which they judge it right to preserve so carefully, nor has a dispensation of mere human mysteries been committed to them, but truly God Himself, who is almighty, the Creator of all things, and invisible, has sent from heaven, and placed among men, Him who is the truth, and the holy and incomprehensible Word, and has firmly established Him in their hearts. He did not, as one might have imagined, send to men any servant, or angel, or ruler, or any one of those who bear sway over earthly things, or one of those to whom the government of things in the heavens has been entrusted, but the very Creator and Fashioner of all things—by whom He made the heavens—by whom he enclosed the sea within its proper bounds—whose ordinances all the stars faithfully observe—from whom the sun has receive the measure of his daily course to be observed—whom the moon obeys, being commanded to shin in the night, and whom the stars also obey, following the moon in her course; by whom all things have been arranged, and placed within their proper limits, and to whom all are subject—the heavens and the things that are therein, the earth and the things that are therein, the sea and the things that are therein—fire, air, and the abyss—the things which are in the heights, the things which are in the depths, and the things which lie between.

Mathetes
Epistle to Diognetus
Chapter VII

Prayers to God and the Saints

Let us then also pray for those who have fallen into any sin, that meekness and humility may be given to them, so that they may submit, not unto us, but to the will of God. For in this way they shall secure a fruitful and perfect remembrance from us, with sympathy for them, both in our prayers to God and our mention of them to the saints.

Clement of Rome
First Epistle to the Corinthians
Chapter LVI

The Apostles appointed bishops

Our apostles also knew, through our Lord Jesus Christ, and there would be strife on account of the office of the episcopate. For this reason, therefore, inasmuch as they had obtained a perfect fore-knowledge of this, they appointed those ministers already mentioned, and afterwards gave instructions, that when these should fall asleep, other approved men should succeed them in their ministry. We are of opinion, therefore, that those appointed by them, or afterwards by other eminent men, with the consent of the whole Church, and who have blamelessly served the flock of Christ in a humble, peaceable, and disinterested spirit, and have for a long time possessed the good opinion of all, cannot be justly dismissed from the ministry. For our sin will not be small, if we eject from the episcopate those whoo have blamelessly and holily fulfilled its duties.

Clement of Rome
First Epistle to the Corinthians
Chapter XLIV

Proper Worship is Orderly and Regular

These things therefore being manifest to us, and since we look into the depths of divine knowledge, it behoves us to do all things in their proper order, which the Lord has commanded us to perform at stated times. He has enjoined offerings to be presented and service to be performed to Him, and that not thoughtlessly or irregularly, but at the appointed times and hours.

Clement of Rome
First Epistle to the Corinthians
Chapter XL

Justification by Faith

All these, therefore, were highly honored, and made great, not for their own sake, or for their own works, or for the righteousness which they wrought, but through the operation of His will. And we, too, being called by His will in Christ Jesus, are not justified by ourselves, nor by our own wisdom, or understanding, or godliness, or works which we have wrought in holiness of heart; but by that faith through which, from the beginning, Almighty God has justified all men; to whom be glory forever and ever. Amen.

Clement of Rome
First Epistle to the Corinthians
Chapter XXXII