The Law of One, Book II, Session 47
Questioner: What stimulus would create what we call an Earth-bound spirit or a lingering ghost?
Ra: I am Ra. The stimulus for this is the faculty of the will.
If the will of yellow-ray mind/body/spirit is that which is stronger than the progressive impetus of the physical death towards realization of that which comes, that is, if the will is concentrated enough upon the previous experience, the entity’s shell of yellow-ray, though no longer activated, cannot either be completely deactivated and, until the will is released, the mind/body/spirit complex is caught.
This often occurs, as we see you are aware, in the case of sudden death as well as in the case of extreme concern for a thing or an other-self.
Questioner: Well then, does orange-ray activation after death occur very frequently with this planet?
Ra: I am Ra. Quite infrequently, due to the fact that this particular manifestation is without will.
Occasionally an other-self will so demand the form of the one passing through the physical death that some semblance of the being will remain.
This is orange-ray.
This is rare, for normally if one entity desires another enough to call it, the entity will have the corresponding desire to be called.
Thus the manifestation would be the shell of yellow-ray.