Conversations with His Divine Grace A. C. Bhaktivedanta Swami Prabhupada
Revatinandana: Is that true, Srila Prabhupada?
Prabhupada: What is that?
Revatinandana: That service to mankind is service God?
Prabhupada: That is nonsense.
Guest: Doctor. For doctor, I mean.
Prabhupada: Well, that is another thing. When doctor gives service to man, he does not give service to the man; he gives service to the money. (laughter)
[The above exchange took place during the question and answer session after a Bhagavatam lecture in Surat, India on January 3, 1971]