Devotee: Will you always be our spiritual master?
Prabhupāda: I don't follow. What do you say?
Devotee: Will you be our spiritual master for eternity?
Prabhupāda: I think so. (laughs) Whatever we do here, it is for eternity because it is not on the material stages. It is all on the spiritual platform. There is a song by Narottama dāsa Ṭhākura, cakhu-dān dilo yei janme janme pitā sei: "One who has opened the eyes, he is, birth after birth, he is my father."
Devotee: Oh, that is... Hare Kṛṣṇa.
Prabhupāda: Cakhu-dān dilo yei. Cakhu-dān means one who has opened the eyes, that is spiritual master. Janme janme pitā sei. Janme janme means birth after birth, he is my father.
(Srila Prabhupada Lecture, Montreal, August 15, 1968)