I have been allowed to talk with some people in the other life who had distanced themselves from the affairs of the world in order to live in devotions and sanctity, and also with some who had mortified themselves in various ways because they thought this was renouncing the world and taming the desires of the flesh. However, most of them had wound up with a gloomy kind of life from this and had distanced themselves from that life of active thoughtfulness that can be led only in the world, so they could not associate with angels. The life of angels is cheerful and blessed. It consists of worthwhile activities that are deeds of thoughtfulness. Particularly, people who have led a life withdrawn from worldly concerns are aflame with a sense of their own worth and constantly crave heaven. They think of heavenly joy as their reward, with no knowledge whatever of what heavenly joy actually is. When they are with angels and are let into that joy—which has no sense of merit and consists of activities and public duties and in bliss at the good that is accomplished through them—they are as bewildered as though they were seeing something totally alien to their faith. Since they are not open to these joys, they move off and associate with people who have led the same kind of life in the world.
There are other people who have lived outwardly devotional lives, constantly in churches and at prayer there. They have mortified their souls while constantly thinking about themselves, how they are worthier and more estimable than others and will be regarded as saints after their death. They are not in heaven in the other life because they have done all this with themselves first in mind. Since they have polluted divine truths by the self-love they immersed them in, some of them are so deranged that they think they are gods. So they are with similar people in hell. Some of them are ingenious and crafty and are in hells for the crafty people who used their skills and wiles to construct outward appearances that would lead the masses to believe them possessed of a divine sanctity.
This includes many of the Catholic saints. I have been allowed to talk with some of them and have had their lives clearly described, both the lives they had led in the world and what they were like afterward. I have mentioned all this to let it be known that the life that leads to heaven is not one of withdrawal from the world but a life in the world, and that a life of piety apart from a life of thoughtfulness (which is possible only in the world) does not lead to heaven at all. Rather, it is a life of thoughtfulness, a life of behaving honestly and fairly in every duty, every affair, every task, from our deeper nature and therefore from a heavenly source. The source of this life is within us when we act honestly and fairly because doing so is in accord with divine laws. This life is not hard, but a life of piety apart from a life of thoughtfulness is hard. Still, this latter life leads away from heaven as surely as people believe it leads to heaven.
from Heaven and Hell, Section 535