Jesus is the primordial first-begotten Word of God, and one and the same with God

As, then, under the force of their pre-judgment, they had convinced themselves from His lowly guise that Christ was no more than man, it followed from that, as a necessary consequence, that they should hold Him a magician from the powers which He displayed,—expelling devils from men by a word, restoring vision to the blind, cleansing the leprous, reinvigorating the paralytic, summoning the dead to life again, making the very elements of nature obey Him, stilling the storms and walking on the sea; proving that He was the Logos of God, that primordial first-begotten Word, accompanied by power and reason, and based on Spirit,—that He who was now doing all things by His word, and He who had done that of old, were one and the same.

Tertullian
Apology
Chapter XXI

Jesus second coming will be all the majesty of Deity unveiled

The Jews, too, were well aware that Christ was coming, as those to whom the prophets spake. Nay, even now His advent is expected by them; nor is there any other contention between them and us, than that they believe the advent has not yet occurred. For two comings of Christ having been revealed to us:  a first, which has been fulfilled in the lowliness of a human lot; a second, which impends over the world, now near its close, in all the majesty of Deity unveiled; and, by misunderstanding the first, they have concluded that the second—which, as matter of more manifest prediction, they set their hopes on—is the only one.

Tertullian
Apology
Chapter XXI

Jesus is generated by the Father as God from God

We have been taught that He proceeds forth from God, and in that procession He is generated; so that He is the Son of God, and is called God from unity of substance with God.  For God, too, is a Spirit. Even when the ray is shot from the sun, it is still part of the parent mass; the sun will still be in the ray, because it is a ray of the sun—there is no division of substance, but merely an extension.  Thus Christ is Spirit of Spirit, and God of God, as light of light is kindled. The material matrix remains entire and unimpaired, though you derive from it any number of shoots possessed of its qualities; so, too, that which has come forth out of God is at once God and the Son of God, and the two are one. In this way also, as He is Spirit of Spirit and God of God, He is made a second in manner of existence—in position, not in nature; and He did not withdraw from the original source, but went forth.  This ray of God, then, as it was always foretold in ancient times, descending into a certain virgin, and made flesh in her womb, is in His birth God and man united.

Tertullian
Apology
Chapter XXI

Christians venerated the Christ in worship to Christ as God

Then, if any of you think we render superstitious adoration to the cross, in that adoration he is sharer with us. If you offer homage to a piece of wood at all, it matters little what it is like when the substance is the same: it is of no consequence the form, if you have the very body of the god.  And yet how far does the Athenian Pallas differ from the stock of the cross, or the Pharian Ceres as she is put up uncarved to sale, a mere rough stake and piece of shapeless wood? Every stake fixed in an upright position is a portion of the cross; we render our adoration, if you will have it so, to a god entire and complete.

Tertullian
Apology
Chapter XVI

Christ’s divinity was clearly shown during Tiberius reign

To say a word about the origin of laws of the kind to which we now refer, there was an old decree that no god should be consecrated by the emperor till first approved by the senate. Marcus Æmilius had experience of this in reference to his god Alburnus.  And this, too, makes for our case, that among you divinity is allotted at the judgment of human beings. Unless gods give satisfaction to men, there will be no deification for them: the god will have to propitiate the man. Tiberius accordingly, in whose days the Christian name made its entry into the world, having himself received intelligence from Palestine of events which had clearly shown the truth of Christ’s divinity, brought the matter before the senate, with his own decision in favour of Christ.  The senate, because it had not given the approval itself, rejected his proposal. Cæsar held to his opinion, threatening wrath against all accusers of the Christians. Consult your histories; you will there find that Nero was the first who assailed with the imperial sword the Christian sect, making progress then especially at Rome.  But

Tertullian
Apology
Chapter V

Christians sang hymns to Christ and God in morning services

For the younger Pliny, when he was ruler of a province, having condemned some Christians to death, and driven some from their steadfastness, being still annoyed by their great numbers, at last sought the advice of Trajan, the reigning emperor, as to what he was to do with the rest, explaining to his master that, except an obstinate disinclination to offer sacrifices, he found in the religious services nothing but meetings at early morning for singing hymns to Christ and God, and sealing home their way of life by a united pledge to be faithful to their religion, forbidding murder, adultery, dishonesty, and other crimes. Upon this Trajan wrote back that Christians were by no means to be sought after; but if they were brought before him, they should be punished.

Tertullian
Apology
Chapter I

We are to love Jesus equally with God

Of these wounds the only physician is Jesus, who cuts out the passions thoroughly by the root,—not as the law does the bare effects, the fruits of evil plants, but applies His axe to the roots of wickedness. He it is that poured wine on our wounded souls (the blood of David’s vine), that brought the oil which flows from the compassions of the Father, and bestowed it copiously. He it is that produced the ligatures of health and of salvation that cannot be undone,—Love, Faith, Hope. He it is that subjected angels, and principalities, and powers, for a great reward to serve us. For they also shall be delivered from the vanity of the world through the revelation of the glory of the sons of God. We are therefore to love Him equally with God.

Clement of Alexandria
The Stromata, Book VIII
Chapter XII

Jesus is eternally generated by the Father and resurrected with a glorified body

Following the Gospel according to John, and in accordance with it, this Epistle also contains the spiritual principle. What therefore he says, “from the beginning,” the Presbyter explained to this effect, that the beginning of generation is not separated from the beginning of the Creator. For when he says, “That which was from the beginning,” he touches upon the generation without beginning of the Son, who is co-existent with the Father. There was; then, a Word importing an unbeginning eternity; as also the Word itself, that is, the Son of God, who being, by equality of substance, one with the Father, is eternal and uncreate. That He was always the Word, is signified by saying, “In the beginning was the Word.” But by the expression, “we have seen with our eyes,” he signifies the Lord’s presence in the flesh, “and our hands have handled,” he says, “of the Word of life.” He means not only His flesh, but the virtues of the Son, like the sunbeam which penetrates to the lowest places,—this sunbeam coming in the flesh became palpable to the disciples. It is accordingly related in traditions, that John, touching the outward body itself, sent his hand deep down into it, and that the solidity of the flesh offered no obstacle, but gave way to the hand of the disciple.

Clement of Alexandria
The Stromata, Book VIII
Chapter VIII

The Greeks had vague references to the Trinity

For I pass over Plato; he plainly, in the Epistle to Erastus and Coriscus, is seen to exhibit the Father and Son somehow or other from the Hebrew Scriptures, exhorting in these words: “In invoking by oath, with not illiterate gravity, and with culture, the sister of gravity, God the author of all, and invoking Him by oath as the Lord, the Father of the Leader, and author; whom if ye study with a truly philosophical spirit, ye shall know.” And the address in the Timœus calls the creator, Father, speaking thus: “Ye gods of gods, of whom I am Father; and the Creator of your works.” So that when he says, “Around the king of all, all things are, and because of Him are all things; and he [or that] is the cause of all good things; and around the second are the things second in order; and around the third, the third,” I understand nothing else than the Holy Trinity to be meant; for the third is the Holy Spirit, and the Son is the second, by whom all things were made according to the will of the Father.

Clement of Alexandria
The Stromata, Book V
Chapter XIV