उपकारेण वीरस्तु प्रतीकारेण युज्यते। अकृतज्ञोऽप्रतिकृतो हन्ति सत्त्ववतां मनः4.27.45।।
upakāreṇa vīrastu pratīkāreṇa yujyate. akṛtajño'pratikṛto hanti sattvavatāṃ manaḥ4.27.45..
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Word Meanings
उपकारेण with him, वीरः hero, प्रतीकारेण by helping in turn, युज्यते will not fail to do, अकृतज्ञः ungrateful, अप्रतिकृतः one who does not return a favour, सत्त्ववताम् spirited people's, मनः heart, हन्ति destroys.
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Source
Valmiki Ramayana
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Chapter
Sarga 27
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Verse
298.45