Verse 23

असावेव हि भूतानां सर्वेषामेव जाग्रताम् ।सर्वानुभविताभूमिरात्मा मुकुरवत्स्थितः

In plain words

That very one, indeed, of all beings, of all who are awake, is the ground on which every experiencing rests -- the ātman, standing like a mirror.