1. Lord Krishna explains that the Vedas recommend prescribed duties or karma-kanda to help purify one's heart on the path of self-realization.
2. These duties like sacrifices were originally established by Lord Vishnu to provide for material necessities and spiritual progress. Demigods are pleased by such sacrifices which leads to prosperity.
3. One who enjoys the gifts of sacrifices without offering them to demigods is considered a thief. Ultimately all sacrifices should be offered to Krishna to become fully purified and free of reactions.