The heretics rob humanity of promotion into God

To whom the Word says, mentioning His own gift of grace: “I said, Ye are all the sons of the Highest, and gods; but ye shall die like men.” He speaks undoubtedly these words to those who have not received the gift of adoption, but who despise the incarnation of the pure generation of the Word of God, defraud human nature of promotion into God, and prove themselves ungrateful to the Word of God, who became flesh for them. For it was for this end that the Word of God was made man, and He who was the Son of God became the Son of man, that man, having been taken into the Word, and receiving the adoption, might become the son of God. For by no other means could we have attained to incorruptibility and immortality, unless we had been united to incorruptibility and immortality. But how could we be joined to incorruptibility and immortality, unless, first, incorruptibility and immortality had become that which we also are, so that the corruptible might be swallowed up by incorruptibility, and the mortal by immortality, that we might receive the adoption of sons?

Irenaeus of Lyons
Against Heresies, Book III
Chapter XIX

 

Man becomes one with God by the Incarnation

For He is a most holy and merciful Lord, and loves the human race. Therefore, as I have already said, He caused man (human nature) to cleave to and to become, one with God. For unless man had overcome the enemy of man, the enemy would not have been legitimately vanquished. And again: unless it had been God who had freely given salvation, we could never have possessed it securely. And unless man had been joined to God, he could never have become a partaker of incorruptibility. For it was incumbent upon the Mediator between God and men, by His relationship to both, to bring both to friendship and concord, and present man to God, while He revealed God to man. For, in what way could we be partaken of the adoption of sons, unless we had received from Him through the Son that fellowship which refers to Himself, unless His Word, having been made flesh, had entered into communion with us?

Irenaeus of Lyons
Against Heresies, Book III
Chapter XVIII

Bodiless souls exists after death before the resurrection

By these things, then, it is plainly declared that souls continue to exist that they do not pass from body to body, that they possess the form of a man, so that they may be recognized, and retain the memory of things in this world; moreover, that the gift of prophecy was possessed by Abraham, and that each class [of souls] receives a habitation such as it has deserved, even before the judgment.

Irenaeus of Lyons
Against Heresies, Book II
Chapter XXXIV

Resurrection is a resuscitation of our same bodies

And then the doctrine concerning the resurrection of bodies which we believe, will emerge true and certain [from their system]; since, [as we hold,] God, when He resuscitates our mortal bodies which preserved righteousness, will render them incorruptible and immortal.

Irenaeus of Lyons
Against Heresies, Book II
Chapter XXIX

Jesus, the first-born form the dead, existed before all

Then, at last, He came on to death itself, that He might be “the first-born from the dead, that in all things He might have the pre-eminence,” the Prince of life, existing before all, and going before all.

Irenaeus of Lyons
Against Heresies, Book II
Chapter XXII

Resurrection is of the same flesh that died

The resurrection is a resurrection of the flesh which died. For the spirit dies not; the soul is in the body, and without a soul it cannot live. The body, when the soul forsakes it, is not. For the body is the house of the soul; and the soul the house of the spirit. These three, in all those who cherish a sincere hope and unquestioning faith in God, will be saved.

Justin Martyr
Fragments from the Lost Work of Justin on the Resurrection
Chapter X

Resurrection is a restoration of the same flesh

They who maintain the wrong opinion say that there is no resurrection of the flesh; giving as their reason that it is impossible that what is corrupted and dissolved should be restored to the same as it had been. And besides the impossibility, they say that the salvation of the flesh is disadvantageous; and they abuse the flesh, adducing its infirmities, and declare that it only is the cause of our sins, so that if the flesh, say they, rise again, our infirmities also rise with it. And such sophistical reasons as the following they elaborate: If the flesh rise again, it must rise either entire and possessed of all its parts, or imperfect. But its rising imperfect argues a want of power on God’s part, if some parts could be saved, and others not; but if all the parts are saved, then the body will manifestly have all its members. But is it not absurd to say that these members will exist after the resurrection from the dead, since the Savior said, “They neither marry, nor are given in marriage, but shall be as the angels in heaven?” And the angels, say they, have neither flesh, nor do they eat, nor have sexual intercourse; therefore there shall be no resurrection of the flesh. By these and such like arguments, they attempt to distract men from the faith.

Justin Martyr
Fragments of the Lost Work of Justin on the Resurrection
Chapter II

The soul waits for judgment after death

“ ‘But I do not say, indeed, that all souls die; for that were truly a piece of good fortune to the evil. What then? The souls of the pious remain in a better place, while those of the unjust and wicked are in a worse, waiting for the time of judgment. Thus some which have appeared worthy of God never die; but others are punished so long as God wills them to exist and to be punished.’

Justin Martyr
Dialogue with Trypho
Chapter V