St. John of Damascus: God the Father

"(We believe) in one Father, the beginning, and cause of all: begotten of no one: without cause or generation, alone subsisting: creator of all: but Father of one only by nature, His Only-begotten Son and our Lord and God and Saviour Jesus Christ, and Producer of the most Holy Spirit. And in one Son of God, the Only-begotten, our Lord, Jesus Christ: begotten of the Father, before all the ages: Light of Light, true God of true God: begotten, not made, consubstantial with the Father, through Whom all things are made: and when we say He was before all the ages we show that His birth is without time or beginning: for the Son of God was not brought into being out of nothing, He that is the effulgence of the glory, the impress of the Father's subsistence, the living wisdom and power (1 Cor 1:24), the Word possessing interior subsistence, the essential and perfect and living image (Heb 1:3) of the unseen God. But always He was with the Father and in Him, everlastingly and without beginning begotten of Him. For there never was a time when the Father was and the Son was not, but always the Father and always the Son, Who was begotten of Him, existed together. For He could not have received the name Father apart from the Son: for if He were without the Son, He could not be the Father: and if He thereafter had the Son, thereafter He became the Father, not having been the Father prior to this, and He was changed from that which was not the Father and became the Father. This is the worst form of blasphemy. For we may not speak of God as destitute of natural generative power: and generative power means, the power of producing from one's self, that is to say, from one's own proper essence, that which is like in nature to one's self."

~St. John of Damascus: Exposition of the Orthodox Faith, Book 1, Ch. 8

St. John of Damascus: The Fall of Man

“THE ENVY of the devil then was the reason of man’s fall. For that same demon, so full of envy and with such hatred of good, would suffer us to enjoy the pleasures of heaven, when he himself was kept below on account of his arrogance, hence the false one tempts miserable man with hope of the Godhead, and leading him up to as great a height of arrogance as himself, he hurls him down into a pit of destruction just as deep.”

~St. John of Damascus: Exposition of the Orthodox Faith, 2, 30.

God the Father

”THE Father is the principle of the whole Deity.”

~St. Augustine: De Trinitate, 4, 20.

“GOD is therefore truly the Father, inasmuch as He if Father of truth; He does not create the Son from outside Himself, but generates Him from His own substance. That is to say, being wise, He generates Wisdom, being just, Justice, be eternal, the Eternal, being immortal, the Immortal, being invisible, the Invisible. Because He is Light, He generates Brightness, and because He is Mind, the Word.”

~Rufinus: Commentary on the Apostles’ Creed, 4. (5th cent.)

St. Ambrose: Penance, the Sacrament

“SINS are forgiven by the Hoy Ghost. . . . Men discharge a ministry for the remission of sins; they do not exercise any power of their own. For they forgive sins not in their own name but in that of the Father and the Son and of the Holy Ghost. They ask, the Godhead gives; the service is man’s, the reward is of the Power on high.”

~St. Ambrose: On the Holy Spirit, 3, 137.

St. Augustine: "It abhors equality with other men under Him"

“HOW much more powerfully do the laws of man's nature move him to hold fellowship and maintain peace with all men so far as in him lies, since even wicked men wage war to maintain the peace of their own circle, and wish that, if possible, all men belonged to them, that all men and things might serve but one head, and might, either through love or fear, yield themselves to peace with him! It is thus that pride in its perversity apes God. It abhors equality with other men under Him; but, instead of His rule, it seeks to impose a rule of its own upon its equals. It abhors, that is to say, the just peace of God, and loves its own unjust peace; but it cannot help loving peace of one kind or other. For there is no vice so clean contrary to nature that it obliterates even the faintest traces of nature.”

~St. Augustine: The City of God, Book 19, Chap. 12.

St. Clement I: "There shall be a future resurrection"

"Let us consider, beloved, how the Lord continually proves to us that there shall be a future resurrection, of which He has rendered the Lord Jesus Christ the first-fruits by raising Him from the dead. Let us contemplate, beloved, the resurrection which is at all times taking place. Day and night declare to us a resurrection. The night sinks to sleep, and the day arises; the day [again] departs, and the night comes on. Let us behold the fruits [of the earth], how the sowing of grain takes place. The sower (Lk 8:5) goes forth, and casts it into the ground, and the seed being thus scattered, though dry and naked when it fell upon the earth, is gradually dissolved. Then out of its dissolution the mighty power of the providence of the Lord raises it up again, and from one seed many arise and bring forth fruit."

~Pope St. Clement I: Letter to the Corinthians, Ch. 24

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"Resurrection" by Andrea da Firenze.
Fresco, A.D. 1366-67; Cappellone degli Spagnoli,
Santa Maria Novella, Florence.

St. Cyril of Jerusalem: "The cross of Christ"

“LET US, therefore, not be ashamed of the cross of Christ; but though another hide it, do thou openly seal it upon thy forehead, that the devils may behold the royal sign and flee trembling far away. Make then this sign at eating and drinking, at sitting, at lying down, at rising up, at speaking, at walking: in a word, at every act.”

~St. Cyril of Jerusalem (c. 313 – 386 AD): Catechetical Discourses, 4, 14.