He who, dwelling in the Ātman, whom the Ātman does not know, whose body is the Ātman, who controls the Ātman from within —He is your Ātman, the Inner Ruler, the Immortal.

A final twist: even the individual ātman —the consciousness we believe ourselves to be— is inhabited by a deeper Ātman. The jīvātman (individual soul) does not know the paramātman (supreme soul) who inhabits it. In our yoga practice, this is the final recognition: even my sense of “I am” is an object of knowledge, not the ultimate knower. There is an Ātman that is witness even of the witness. That is the antaryāmin, the immortal, the non-dual.