18.47 Svadharmah, one's own duty; though vigunah, defective-the word though has to be supplied-; is sreyan, superior to, more praiseworthy than; paradharmat, another's duty; su-anusthitat, well performed. Kurvan, by performing; karma, a duty; svabhavaniyatam, as dictated by one's own nature-this phrase means the same as svabhavajam (born from Nature) which has been stated earlier-; na apnoti, one does not incur; kilbisam, sin. As poison is not harmful to a worm born it it, so one does not incur sin by performing a duty dictated by one's own nature.
It has been siad that, as in the case of a worm born in poison, a person does not incur sin while performing his duties which have been dictated by his own nature; and that someone else's duty is fraught with fear; also that, one who does not have the knoweldge of the Self, (he) surely cannot remain even for a moment without doing work (cf. 3.5). Hence-