The Yoga of Liberation by Renunciation

Krishna explains the third and proper kind of relinquishment: sattvic tyaga. 'Kāryam ity eva yat karma niyataṁ kriyate'—that action (karma) which is performed (kriyate) as duty (kāryam), as prescribed (niyatam). 'Saṅgaṁ tyaktvā phalaṁ caiva'—having abandoned attachment (saṅgam tyaktvā) and fruit (phalam). 'Sa tyāgaḥ sāttviko mataḥ'—that relinquishment (tyāgaḥ) is considered (mataḥ) sattvic (sāttvikaḥ). This is the proper kind of tyaga: performing prescribed duty (not abandoning it) while relinquishing attachment to both the action and its fruits. This is sattvic because it comes from understanding, not from delusion (tamasic) or fear (rajasic). You perform duty because it's duty, not because you're attached to it or its results. This is the path: duty without attachment to action or fruits.