From the article:

Modern Westerners have a clear boundary between mind and world, even mind and body. Moral and other meanings are “in the mind.” They cannot reside outside, and thus the boundary is firm. But formerly it was not so. Let us take a well-known example of influence inhering in an inanimate substance, as this was understood in earlier times. Consider melancholy: black bile was not the cause of melancholy, it embodied, it was melancholy. The emotional life was porous here; it didn’t simply exist in an inner, mental space. Our vulnerability to the evil, the inwardly destructive, extended to more than just spirits that are malevolent. It went beyond them to things that have no wills, but are nevertheless redolent with the evil meanings.

See the contrast. A modern is feeling depressed, melancholy. He is told: it’s just your body chemistry, you’re hungry, or there is a hormone malfunction, or whatever. Straightway, he feels relieved. He can take a distance from this feeling, which is ipso facto declared not justified. Things don’t really have this meaning; it just feels this way, which is the result of a causal action utterly unrelated to the meanings of things. This step of disengagement depends on our modern mind/body distinction, and the relegation of the physical to being “just” a contingent cause of the psychic.

But a pre-modern may not be helped by learning that his mood comes from black bile, because this doesn’t permit a distancing. Black bile is melancholy. Now he just knows that he’s in the grips of the real thing.

Here is the contrast between the modern, bounded, buffered self and the porous self of the earlier enchanted world. As a bounded self I can see the boundary as a buffer, such that the things beyond don’t need to “get to me,” to use the contemporary expression. That’s the sense to my use of the term “buffered” here and in A Secular Age. This self can see itself as invulnerable, as master of the meanings of things for it.

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Perhaps the clearest sign of the transformation in our world is that today many people look back to the world of the porous self with nostalgia, as though the creation of a thick emotional boundary between us and the cosmos were now lived as a loss. The aim is to try to recover some measure of this lost feeling. So people go to movies about the uncanny in order to experience a frisson. Our peasant ancestors would have thought us insane. You can’t get a frisson from what is really in fact terrifying you.

The second facet is that the buffered self can form the ambition of disengaging from whatever is beyond the boundary, and of giving its own autonomous order to its life. The absence of fear can be not just enjoyed, but becomes an opportunity for self-control or self-direction.