(Prabhupada's lecture - Śrīmad-Bhāgavatam 1.16.20 - Los Angeles, July 10, 1974)
So any field of activities, if we act for Kṛṣṇa, that is called yajña. Yajña means to act for the satisfaction of the Supreme Personality of Godhead or the supreme authority. Just like a good citizen. A good citizen means who is acting exactly to the regulative laws. He is good citizen. Even in ordinary driving car, if you exactly follow the rules and regulation of traffic transaction, if you stop when there is red light, if you start when there is green light, you don't go to the left, if you follow these rules and regulation, then there is no question of your being a criminal. But as soon as you do not follow, immediately you are criminal. You will get a ticket.
Therefore the regulative life means... That is religious life, when you execute your occupational duty just according to the law. There are state laws and there are laws also. So actually, we should perform the divine laws. State law is subordinate. That is legal. Otherwise illegal. But unfortunately, the whole state at the present moment, they are also illegal. Therefore what about the citizens? They are also illegal. And because both of them illegal, these illegal, illegitimate acts are being done, so many slaughterhouses are maintained, and people are eating meat illegally and becoming subjected to the sinful life. That is warned here. So read the purport.