तपसा निर्दहेल्लोकान्क्रुद्धो वा निर्दहेदपि | सर्वधातिप्रवृद्धोऽसौ रावणो राक्षसाधिपः || ५-५९-३
"The demon king is rich in asceticism. He can burn the whole world with the power of his penance. In spite of Sita's anger he was not burnt (Hanuman gives the reason for Ravana's survival). [5-59-3]
तस्य तां स्पृशतो गात्रं तपसा न विनाशितम् | न तदग्निशिखा कुर्यात्संस्पृष्टा पाणिना सती || ५-५९-४
The power of Ravana also, created by austerities, is great and it is because of this that he was not destroyed when he laid hands on Sita. Even, the flame to which one reaches out..... - [5-59-4]