Sometimes people misunderstand, thinking that to live completely dependent upon the Lord means to not do anything themselves, and just wait for the Lord to provide. A parasite is something that depends upon somebody else’s mercy. It lives off the work and efforts of others, but does not contribute anything itself. Prabhupada explains in Bhagavad-gita that devotees are not idle parasites. Everybody has some work to perform, and those who do not perform their work are a disturbance to society. Thus, we must perform our duties, but the perfection of our duties is to do it for the satisfaction of the Lord. This is what distinguishes the devotee from the non-devotee.
(LFD Vol 3, Full Surrender, Pg 81, 4th paragraph)