One should discharge one’s duty on Lord Krishna’s behalf and all one’s actions will be saturated with Krishna Conscious thought, the highest pattern of trance in spiritual realization.
It is our duty to act in Krishna consciousness because we are constitutionally parts and parcels of the Supreme.
Path of Perfection, Chapter 1
The occupational activities a man performs according to his own position are only useless labor if they do not provide attraction for the message of the Personality of Godhead.
One who performs his duty without attachment, surrendering the results unto the Supreme Lord, is unaffected by sinful action, as the lotus leaf is untouched by water.