The Dark Night of the Soul.

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The dark night of the soul is where you go from thinking all is separate to knowing all is self. That's one. Now it is true that there is still diversity or difference in the world (the world is self really which maybe is why it is called bio-diversity with bio not just meaning life but also self). So the final step in self-realization is the understanding that the purpose of self is companionship i.e. love which is why self is diverse or different in life. It is a state of love bliss.
~ Wald Wassermann, Physicist