For one who is proud, his whole psyche is completely forgetful of the fact that he is actually subordinate. However, the best person to give Krishna consciousness to others is he who teaches by his own example how to be a servant. He is thus subservient to the superior order. That was the criterion for Prabhupada’s success. Of course, Prabhupada is nitya-siddha (eternally liberated); he came from the spiritual world just to give us Krishna consciousness. However, he showed us the perfect example throughout his whole life by giving every fiber of his existence in serving the higher order given by his Guru Mahäräja. He never forgot that position in everything that he did. While crying, he said, “My Guru Maharaja has sent all of you to me simply so that I can serve his order.” He always felt such overwhelming gratitude in his heart. This is humility.
(Lectures from a disciple, Vol 3, Expansion of Krishna Consciousness , Pg 391, 3rd Paragraph)