Oecumenius

But what are those things that are in the world? They are the lust of the flesh that are fulfilled by the lust stirred up by the flesh. For the eyes, which hold the foremost place among the senses, encompass everything else as well. All evil revolves around lust: adultery, drunkenness, inappropriate love; arrogance, wanting to surpass everyone, suggested by lust so that whatever arises is accomplished by arrogance; murders, indeed these for greed, those to destroy adversaries; deceit, and these so that whatever is a barrier to us, we …

Commentary on 1 John ↗

Augustine of Hippo

"And the lust of the eyes:" by "the lust of the eyes," he means all curiosity. Now how wide is the scope of curiosity! This it is that works in spectacles, in theatres, in sacraments of the devil, in magical arts, in dealings with darkness: none other than curiosity. …

Ten Homilies on 1 John 2 ↗

Bede

Since all that is in the world, etc. All that is in the world, he says, refers to all who dwell in the world with their minds, who inhabit the world with love; just as they inhabit heaven who have their conversation in heaven, whose hearts are above, although they walk in the flesh on earth. Therefore, all that is in the world, that is, all lovers of the world, have nothing but the lust of the flesh, the lust of the eyes, and the pride of life. By these names of vices, he comprehends all kinds of vices. …

Commentary on the Catholic Epistles ↗

Bonaventure

Of actual sins there is one beginning, a twofold root, a threefold fuel, and a sevenfold head or capital sin. There is one beginning, namely pride; a twofold root, namely fear wrongly humbling and love wrongly inflaming; a threefold fuel, according to the three things that are in the world, namely the concupiscence of the flesh, the concupiscence of the eyes, and the pride of life; and a sevenfold head, namely pride, envy, wrath, sloth, avarice, gluttony, and lust. …

Breviloquium, Part 3, Chapter 9 ↗