It is the performance of that duty prescribed by the Vedas for each one. Worldly life must progress on the right lines. Social life will be orderly only if the duties to be performed by using brain power, the duties performed by traders and merchants, and duties to be performed in the form of physical labor, do not conflict with each other but complement each other.
The thought of helping others and of service and sacrifice are the virtuous ones which would remove sinful thoughts. We call it love.