Everyone should act yajna. Yajna means work to satisfy the Supreme Lord. That is called yajna. If we do not do that, then we shall be obliged. Otherwise... "Otherwise" means the act which is done for the satisfaction of the Supreme Lord, that is immune from all reaction, but anything which is not done for the satisfaction of the Supreme Lord, that will oblige me in so many bondage of obligation, and I will have to repay that after many, many continuation of this repetition of births and deaths. That is the secret of life.
Lecture on Bhagavad-gita 3.8-13, New York, May 20, 1966