Devotee: Srila Prabhupada, when you are not present with us, how is it possible to receive instructions, for example, on questions that may arise?
Prabhupada: Well, the questions... Answers are there in my books.
Devotee: Other than that, for example, that we would ask you in...
Devotee: Do you direct us also through the heart? Besides the Paramatma?
Prabhupada: If your heart is pure. Everything depends on purity.
(Srila Prabhupada Morning Walk, Los Angeles, May 13, 1973)