Post Mortem Life and the Inconscient

What is it that causes the mind to entertain post mortem survival even if full knowledge will only be possible if there is such a state. My intuition is that the development of consciousness in a person has an open ended quality to it. As we go on there is the enlarging of vistas as though consciousness as such had an unrestricted nature that was only limited by a personal inconscience. That strange word is used by Aurobindo and he defines it:

Inconscient is a status and power of involved consciousness in which being is plunged into another and opposite state of non-manifestation resembling non-existence so that out of it all in the material universe may be manifested. It is a bed-rock for all resistance in the individual and the world to the victory of the Spirit and the Divine Work. Man in spite of its mental power is often impotent before the inconscient and subconscient which obscure its clarity and carry it away on the tide of instinct or impulse; in spite of its clarity it is fooled by vital and emotional suggestions into giving sanction to ignorance and error, to wrong thought and wrong action, or it is obliged to look on while the nature follows what it knows to be wrong, dangerous or evil.

A person can have a sudden access of consciousness beyond their usual state and while it lasts it is natural. It is the inconscient that is a self imposed alienation.