What if those voices encouraging you to good things as just a positive form of schizophrenia or some other mental disorder normally normally associated with bad thoughts or actions?
Could they be the foundation or source of religious experiences or other phenomenon related to people being overwhelmingly compelled to do a kind act that not normally in their nature or best interest?
Red Dwarf positive virus theory. That is that one could assume there are positive viruses the have rather opposite effects to what are normally considers negative effect viruses.
Its just a theory my positive voices came up with!
(I personaly could care less.)