Since only a few people in the Protestant Christian world practice repentance, it is important to add that those who have not looked at or studied themselves eventually do not even know what damnable evil or saving goodness is, because they lack the religious practice that would allow them to find out. The evil that we do not see, recognize, or admit to stays with us; and what stays with us becomes more and more firmly established until it blocks off the inner areas of our minds. As a result, we become first earthly, then sense-oriented, and finally bodily. In these cases we do not know of any damnable evil or any saving goodness. We become like a tree on a hard rock that spreads its roots into the crevices in the rocks and eventually dries up because it has no moisture.
All people who were brought up properly are rational and moral. There are different ways of being rational, however: a worldly way and a heavenly way. People who have become rational and moral in a worldly way but not also in a heavenly way are rational and moral only in word and gesture. Inwardly they are animals, and predatory animals at that, because they are in step with the inhabitants of hell, all of whom are like that. People who have become rational and moral in a heavenly way as well, however, are truly rational and truly moral, because they have these qualities in spirit as well as in word and deed. Something spiritual lies hidden within their words and actions like the soul that activates their earthly, sense-oriented, and bodily levels. Such people are in step with the inhabitants of heaven.
Therefore there is such a thing as a rational, moral person who is spiritual, and such a thing as a rational, moral person who is only earthly. In the world you cannot tell them apart, especially if their hypocrisy is well rehearsed. Angels in heaven can tell the two apart, however, as easily as telling doves from eagle-owls or sheep from tigers.
Those who are only earthly can see good and evil qualities in others and criticize them, but because they have never looked at or studied themselves, they see no evil in themselves. If someone else discovers an evil in them, they use their rational faculty to hide it, as a snake hides its head in the dust; then they plunge themselves into that evil the way a hornet dives into dung.
Their delight in evil is what has this blinding effect. It surrounds them like a fog over a swamp, absorbing and suffocating rays of light. This is the nature of hellish delight. It radiates from hell and flows into every human being, but only into the soles of our feet, our back, and the back of our head. If we receive that inflow with our forehead and our chest, however, we are slaves to hell, because the human cerebrum serves the understanding and its wisdom, whereas the cerebellum serves the will and its love. This is why we have two brains. The only thing that can amend, reform, and turn around hellish delight of the kind just mentioned is a rationality and morality that is spiritual.
from Regeneration, Pages 43-44