Ramayana
अर्थिनः कार्यनिर्वृत्तिमकर्तुरपि यश्चरेत् । तस्य स्यात्सफलं जन्म किं पुनः पूर्वकारिणः ॥ ४-४३-७
'Our life becomes fruitful when we help a person who was not helped us. What to speak of returning the help one has rendered. ॥ 4-43-7॥
english translation
arthinaH kAryanirvRttimakarturapi yazcaret । tasya syAtsaphalaM janma kiM punaH pUrvakAriNaH ॥ 4-43-7
hk transliteration by Sanscript