Lord Krishna confirms that yagna or propitiation and worship also corresponds to the three gunas or modes of material nature and is threefold. That yagna which is performed and offered to the Supreme Lord following the ordinances and injunctions of the Vedic scriptures in the prescribed manner which is compulsory by Vaisnavas and brahmanas for the exclusive satisfaction for the Supreme Lord without any desire for rewards is known to be in sattva guna the mode of goodness. How is this enacted one may ask? It is performed out of duty for its own sake or out of bhakti which is exclusive loving devotion to Lord Krishna or any of His authorised avatars or incarnations and expansions as revealed in Vedic scriptures.

There is no commentary to Chapter 17, verse 12 by Madhvacarya.

Lord Krishna explains the three fold nature of yagna or performing rituals of propitiation and worship. He begins with sattva guna the mode of goodness. The words aphala-akariksibhih means performing yagna to the Supreme Lord without a desire for any reward. Vidhi-distah means performing it in accordance with the ordinances and injunctions of the Vedic scriptures. Yastavyam eveti means performed as a matter of duty or as bhakti exclusive loving devotion unto the Supreme Lord Krishna or any of His authorised avatars or incarnations and expansions as revealed in Vedic scriptures. Such yagnas must be performed by duly initiated Vaisnavas and brahmanas chanting prescribed Vedic mantras for the exclusive satisfaction of the Supreme Lord. When such a resolve manifests a yagna into reality in this manner it is to be known as situated in sattva guna.

Now Lord Krishna elaborates on the threefold divisions of yagna or propitiation and worship to the Supreme Lord or any of His authorised incarnations and expansions as revealed in Vedic scriptures. The yagna that is performed aphala-akanksibhih meaning with no desire for any fruitive rewards and is ordained by the ordinances and injunctions of the Vedic scriptures. Following the prescribed procedures, chanting the prescribed mantras, utilising prescribed ingredients, sanctified by duly initiated Vaisnavas and brahmanas who perform it as either a matter of duty or out of devotion to the Supreme Lord are known as situated in sattva guna or mode of goodness.