To the physicist – but only to him – I could hope to make my view clearer by saying: The living organism seems to be a macroscopic system which in pa… - Erwin Schrödinger

If I try to hold on the currently predominant view and derive the unity of my self, … I find myself with an impenetrable thicket of questions. … Why is it precisely at this intermediate level in the hierarchy of successively superimposed unities (cell, organ, human body, state)—why, I ask, it is precisely at the level of my body that unitary self-consciousness comes into the picture, whereas the cell and the organ do not as yet possess it and the state possesses it no longer?

If it were not so, if we were organisms so sensitive that a single atom, or even a few atoms, could make a perceptible impression on our senses - Heavens, what would life be like!

The multiplicity is only apparent. This is the doctrine of the Upanishads. And not of the Upanishads only. The mystical experience of the union with God regularly leads to this view, unless strong prejudices stand in the way.