There are many examples where Prabhupada saw a devotee thinking that his service was above everyone else’s, and he would smash such a mentality. Although it appeared that everything was flourishing for that devotee, Prabhupada would pull him out of that service. Prabhupada was teaching that no one should think that his service is more important than anybody else’s; otherwise he becomes useless.
LFD Vol 3, Eligibility for Devotional Service Pg 157, 2nd paragraph