Valmiki Ramayana 2.35.7
यन्म हेम्द्रमिवाजय्यम् दुष्प्रकम्प्यमिवाचलम् ।महोदधिमिवाक्षोभ्यम् सन्तापयसि कर्मभिः॥
yanma hemdramivājayyam duṣprakampyamivācalam |mahodadhimivākṣobhyam santāpayasi karmabhiḥ ||
Our plain-language meaning of this verse is waiting for scholar review.