The more one feels imperfect in Krishna’s service, the more he is advancing in Krishna Consciousness. Even the topmost devotees feel they are inadequate in their service to the Lord. So it is good to feel inadequate, and to try harder to please Krishna with better service. But one should never feel, oh, I have seen Krishna, and so I am reached perfection-this is not Krishna Consciousness.

From Srila Prabhupada’s letter to Hansadutta, Himavati, Mar. 3, 1968