If you follow the thread all the way you'll discover that in this philosophy, whose roots are to be found in the mystical tradition of Hinduism - Advaita Vedant

If you follow the thread all the way you'll discover that in this philosophy, whose roots are to be found in the mystical tradition of Hinduism - Advaita Vedanta, your essential conscious being is shared (I'm wary of the western use of "self-conscious", that is why I have omitted it). Therefore, what is really being said is that without the realization that our most intimate identity is (===, reference equality) that of everything else, happiness (defined as equanimity) cannot be achieved. It is actually the opposite of individualism.