From the early Church Fathers to now.
5 Patristic · 1 Orthodox
“These are they, who separate themselves, sensual men, having not the Spirit.”
“"Those," he says, "separating" the faithful from the unfaithful, be convicted according to their own unbelief. And again those separating from the flesh. He says, "Animal not having the spirit;" that is, the spirit which is by faith, which supervenes through the practice of righteousness.”
“The enemy of unity has no share in God's love. Those who are outside the church do not have the Holy Spirit, and this verse is written of them.”
“The Nestorians are sensual men, not having the Spirit, because they divide the one Christ and Son and Lord into two sons.… For they pretend to confess one Christ and Son and say that his person is one, but by dividing him into two separate hypostases they completely sweep away the doctrine of the mystery.”
“These are they who separate themselves, etc. Therefore, they reprobate themselves by separating from the lot of the righteous, hence they are sensual, that is, following the lusts of their own soul, because they have not merited to possess the Spirit of unity by which the Church is gathered together, by which it is made spiritual. Therefore, they dissolve, because they lack the bond of charity.”
“Here is yet another fault of these most vile people. They, he says, not only perish themselves, but also snatch away the nurslings of the Church (this is what "those who separate" means), that is, they lead them beyond the boundaries of the Church, that is, the boundaries of the faith or even of the church enclosure itself. For they have made their assemblies into dens of robbers, and they lead others away from the Church and bring them to themselves. They do this because they are soulish people, that is, people who live according to the manner of the world. For we have already noted that Holy Scripture has the custom of calling the life also "soul." And the Apostle Paul says that soulish people cannot receive the things of the Spirit of God (1 Cor. 2:14). So, being soulish, they also employ soulish teaching, of which it is said: "This is not the wisdom that descends from above, but is earthly, soulish, demonic" (James 3:15), not having the Spirit of God.”
“"These are the ones who are causing divisions." Behold, another accusation against these very small men. For they are not the only ones, Jude says, who perish, but they also rob the nourishments of those of the Church, (for this is what the term "cause division" intends to signify), that is, making them outside the ecclesiastical boundaries, either of the faith or even of the very holy tabernacle of the Church. For having shown their gatherings to be a den of thieves, they lead away from the Church, but bring to themselves. And they do this, being worldly people, that is, living according to the behavior of the world. For we have already said that the divine Scripture often calls the soul and life, as in Job; "All that a man has, he will give for his soul," (Job 2:4) that is, for his life. Of these, Paul says that they are natural men, unable to accept the things of the Spirit of God. (1 Cor. 2:14) Being worldly, they are taught by natural means, concerning which it has been said: This wisdom is not from above, descending from the Father of lights (James 1:17), but is earthly, demonic, not having the Spirit of God speaking.”
The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.