Verse 2

तदेवात्मानुसंधानमत्यजन्सममिन्द्रियैः ।चेतसा कलयामास दृष्टलोकपरावरः

In plain words

Not abandoning that same contemplation of the self, he reflected with his mind, together with his senses — he who had seen the higher and the lower worlds.