Verse 13

वैरिञ्चपदमासाद्य मनो ब्रह्मन्महामते ।इदं जगत्सुघनतां कथमानयति क्रमात्

In plain words

Śrī Rāma said: Having attained the station of Viriñci, O brāhmaṇa, O great-minded one — how does the mind, by stages, bring this world to such density?