Verse 44

अयं सोऽहमिदं चित्तमित्याद्यर्थोत्थया गिरा ।शब्दप्रतिश्रवेणाद्राविवात्मात्मनि जृम्भते

In plain words

'This is that,' 'I,' 'this citta' -- by speech arisen from such meanings, as by a mountain answering to a sound -- the Self unfolds within the Self.