As long as people who are caught up in the love for themselves and the world are living in the body, they feel the pleasure that stems from those loves and the pleasure of the gratifications that result from those loves. As long as people who are focused on love for God and love for their neighbor are living in the body, though, they have no obvious sense of the pleasure that stems from those loves and from the good affections that arise from them. All they feel is a sense of well-being that is barely perceptible because it is hidden away in their deeper natures, veiled by the outer sensations of their bodies and dulled by the cares of this world. Our state changes completely after death, however. Then the pleasures of love for ourselves and the world turn into painful and fearful sensations because within them is what we call hellfire, and also into foul and unclean things that answer to their filthy gratifications—all of which, remarkably enough, are now quite delightful to them.
In contrast, the faint sense of pleasure, the almost imperceptible sense of well-being that was found in people who were focused on love for God and love for their neighbor in the world, turns into the pleasure of heaven, perceptible and palpable in countless ways. That sense of well-being that had been lying hidden in their deeper natures while they lived in the world is now unveiled and released into open sensation, because now they are in the spirit, and this was the delight of their spirit.
from Heaven and Hell, Section 401