Ramayana
तस्य चिन्तयतो यत्नो दुःखक्षयकरो भवेत् । स तथेति प्रतिज्ञाय मारुतिर्भीमविक्रमः ॥ ५-३९-५
'If you think of it carefully, your effort will become the one which can remove my misfortunes.' That Hanuman of terrific prowess, having promised 'so be it' - ॥ 5-39-5॥
english translation
tasya cintayato yatno duHkhakSayakaro bhavet । sa tatheti pratijJAya mArutirbhImavikramaH ॥ 5-39-5
hk transliteration by Sanscript