Verse 16

अथेमं चिन्तयामास संसारामयभीरुधीः ।एकान्त एव निवसन्कदाचित्कान्तमानसः

In plain words

Then -- his intellect fearful of the sickness that is saṃsāra -- dwelling in solitude, at a certain time, his mind serene and lovely, he pondered this: