Verse 58

आत्मैवेदं जगत्सर्वमित्यन्तः संविदोदये ।क्व चेता क्वच वा चित्तं किं चेत्यं चेतनं च किम्

In plain words

When, within, there dawns the realization that this whole world is ātman alone -- then where is the thinker? Where, indeed, is citta? What is the object of thought, and what the thinking?