What dissolves is not the 'essential spirit' but the accumulated baggage of the conditioned self. Loss of self here is the loss of false ego constructs. I don't, though, quite see how the Christian view differs here, in terms of the need to 'purge' ourselves of false constructs of the ego. We have to do that, in order to see how we are reflections of the divine spirit. Nonetheless, in practice people do seem to equate the two.
Moral action leads to comfort and prosperity.
And unlike in Jung's locked-sweet shop scheme of things, many people seem to expect to get their reward here and now. Well, a new car and a better job might ease it an iota, I suppose. Some are born to endless night.