upakārēṇa by a help, vīraḥ a hero, pratikārēṇa by helping in turn, yujyatē a suitable step is taken, akṛtajñaḥ ungrateful, apratikṛtaḥ one who does not help, sattvavatām of the virtuous people, manaḥ heart, hanti hurts.
A hero should in return help whoever has helped him. An ungrateful person hurts the heart of the virtuous by not returning the assistance.'