Valmiki Ramayana Yuddha Kanda Sarga 68 Shloka 20
Original Shlokaदेवाहिमांहसिष्यन्तिदृष्टवापूर्वापकारिणम् । कथमिन्द्रंजयिष्यामिकुम्भकर्ण हतेत्वयि ।।6.68.20।।
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पूर्वापकारिणम् earlier harmed, माम् by me, दृष्टवा seeing, देवाः Devatas, हसिष्यन्तिहि will laugh at me, कुम्भकर्ण Kumbhakarna, त्वयि your, हते destruction, इन्द्रम् Indra, कथम् how, जयिष्यामि will I win?.
"Devatas who were harmed by me earlier will laugh at me now that Kumbhakarna is slain. How will I win Indra?"