"Never think that I am absent from you. Physical presence is not essential; presence by message (or hearing) is real touch. Lord Krishna is present by His message which was delivered 5,000 years ago. We feel always the presence of our past Acharyas simply by their immutable instructions. I hope you will understand me right and do the needful."
(Srila Prabhupada, letter to "My dear Students," 2nd August, 1967)