Verse 40

बहिष्ठेनान्तरं बाह्यमन्तःस्थेनान्तरस्थितम् ।यथाविदितमात्मायं स्वचित्तमनुपश्यति

In plain words

Through what stands outside, the inward is outward; through what stands within, it stands within: this self beholds its own citta just as it has come to know it.