Clement of Alexandria
Here it is fitting to recall the heresy whose leader wished to conquer sensuality by plunging into it.
Those who regard themselves as followers of Nicholas teach something similar. They interpret in their own way his words: "The flesh must be used contrary to its purpose," dein paraxrhsthai te sarki.
In truth, this orthodox man meant by his saying only that we must mortify the flesh. That is, we must curb its lusts and impulses by strict restraint of sensuality and desires.
But they drown in sensual pleasure like goats. As though mocking the body, they shorten their life in fleshly amusements, failing to consider that the body is already weak by its very nature.
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Because of this, it is reduced to ruin. Their soul follows the call of bodily impulses more than the teaching of the apostolic man, and sinks into the mire of vice.
How does their life differ from the life of Sardanapalus, about whom it is written: abundant food, passions, and pleasures of love. All this luxury, alas, is now inaccessible. Now I am dust, once the glorious king of Nineveh.
But when we mentioned Nicholas earlier, we forgot one point. They say he had a beautiful wife.
Soon after the Lord's Ascension, when the Apostles accused him of jealousy, he brought her to them and said that anyone who wished could possess her.
They say that such conduct fully accorded with the principle: "One must abuse the flesh," paraxrhsasthai te sarki dei.
The members of this sect followed his words and, acting simply and without discernment, took up complete corruption.
Yet I know testimony that Nicholas himself had sexual relations with no one except his wife. His daughters lived to old age and remained virgins, and his sons were strangers to corruption.
In our case, his conduct is explained by his desire to show the Apostles, among whom he had been accused of jealousy, that passion for his wife did not rule him.
In this way he sought to teach how one should "abuse the flesh." I think he did not wish, like the Savior, to "serve two masters" (Mt 6:24), passion and God.
Eusebius of Caesarea and Bede the Venerable share Clement's opinion of the Nicolaitans. Yet other Christian authors accused Nicholas the deacon of having been the initiator of this heresy; see Irenaeus of Lyons, Against Heresies 1.26.3.