Valmiki Ramayana 6.39.20

मनसा अपि दुरारोहम् किम् पुनः कर्मणा जनैः ।निविष्टा तत्र शिखरे लन्का रावण पालिता॥

manasā api durāroham kim punaḥ karmaṇā janaiḥ |niviṣṭā tatra śikhare lankā rāvaṇa pālitā ||

Our plain-language meaning of this verse is waiting for scholar review.