If you do not work for that supreme perfect, then you will be bound up and your, this encagement of body will continue. This encagement of body will continue if you work on your own responsibility and not for the supreme purpose of the Supreme Lord, Yajna, or Visnu. That is the secret. Yajna means yajno vai visnuh. It is sruti. Sruti means the Vedic literature, the Vedic hymns. They prove it, "Yajna means Visnu." Visnuh tu sartham karma samacara.(?) Therefore we have to work for the satisfaction of Visnu. That is called Yajna.
Lecture on Bhagavad-gita 3.8-13, New York, May 20, 1966