Materials and living beings' bodies belong to the world but inner spirit to upper world;
Spirit comes down to world to be born as any living being for a sojourn only;
That's for feeling and thinking to perceive and conceive matters of consciousness;
That takes place by communion of mind with Nature in super-conscious state!
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Training in Nature is the best preparation for human spirit to be one with Universal Spirit; Once realization and resolution are fixed, one's journey to leave world is blissful indeed!