Quotes

Jesus sanctified humanity having lived the full human experience

For He came to save all through means of Himself—all, I say, who through Him are born again to God—infants, and children, and boys, and youths, and old men. He therefore passed through every age, becoming an infant for infants, thus sanctifying infants; a child for children, thus sanctifying those who are of this age, being at the same time made to them an example of piety, righteousness, and submission; a youth for youths, becoming an example to youths, and thus sanctifying them for the Lord. So likewise He was an old man for old men, that He might be a perfect Master for all, not merely as respects the setting forth of the truth, but also as regards age, sanctifying at the same time the aged also, and becoming an example to them likewise.

Irenaeus of Lyons
Against Heresies, Book II
Chapter XXII

Only one God, the Creator

How much safer and more accurate a course is it, then, to confess at once that which is true: that this God, the Creator, who formed the world, is the only God, and that there is no other God besides Him—He Himself receiving from Himself the model and figure of those things which have been made—than that, after wearying ourselves with such an impious and circuitous description, we should be compelled, at some point or another, to fix the mind on some One, and to confess that from Him proceeded the configuration of things created.

Irenaeus of Lyons
Against Heresies, Book II
Chapter XVI

The Church tradition is that God created on His own

For even creation reveals Him who formed it, and the very work made suggests Him who made it, and the world manifests Him who ordered it. The Universal Church, moreover, through the whole world, has received this tradition from the apostles.

Irenaeus of Lyons
Against Heresies Book II
Chapter III

God created purely from conception in his mind

Let them cease, therefore, to affirm that the world was made by any other; for as soon as God formed a conception in His mind, that was also done which He had thus mentally conceived. For it was not possible that one Being should mentally form the conception, and another actually produce the things which had been conceived by Him in His mind.

Irenaeus of Lyons
Against Heresies Book II
Chapter III

Heretics claim angels formed creation, but only God did

Those, moreover, who say that the world was formed by angels, or by any other maker of it, contrary to the will of Him who is the Supreme Father, err first of all in this very point, that they maintain that angels formed such and so mighty a creation, contrary to the will of the Most High God.

…With justice, therefore, according to an analogous process of reasoning, the Father of all will be declared the Former of this world, and not the angels, nor any other [so-called] former of the world, other than He who was its Author, and had formerly been the cause of the preparation for a creation of this kind.

…He formed all things that were made by His Word that never wearies. For this is a peculiarity of the pre-eminence of God, not to stand in need of other instruments for the creation of those things which are summoned into existence. His own Word is both suitable and sufficient for the formation of all things, even as John, the disciple of the Lord, declares regarding Him: “All things were made by Him, and without Him was nothing made.”

Irenaeus of Lyons
Against Heresies Book II
Chapter II

Heresies give birth to other heresies and continue to divide

Many offshoots of numerous heresies have already been formed from those heretics we have described. This arises from the fact that numbers of them—indeed, we may say all—desire themselves to be teachers, and to break off from the particular heresy in which they have been involved. Forming one set of doctrines out of a totally different system of opinions, and then again others from others, they insist upon teaching something new, declaring themselves the inventors of any sort of opinion which they may have been able to call into existence.

Irenaeus of Lyons
Against Heresies Book I
Chapter XXVIII