The Basis of Morality by Part 4 Chapter 2 Page 19

“Individuation is merely an appearance, born of Space and Time; the latter being nothing else than the forms under which the external world necessarily manifests itself to me, conditioned as they are by my brain's faculty of perception.

Hence also the plurality and difference of individuals is but a phaenomenon, that is, exists only as my mental picture. My true inmost being subsists in every living thing, just as really, as directly as in my own consciousness it is evidenced only to myself.” This is the higher knowledge: for which there is in Sanskrit the standing formula, tat tvam asi, “that art thou.” Out of the depths of human nature it wells up in the shape of Compassion, and is therefore the source of all genuine, that is, disinterested virtue, being, so to say, incarnate in every good deed.