"So is there any science to give knowledge how one becomes immortal? Yes, there is. You can become immortal. Not in this material science; not in the so-called universities. But there is knowledge in the Vedic scripture by which you can become immortal. That is better position. No more death, no more birth, no more old age, no more disease. So guru's task is very great responsibility. He has to guide the disciple how to make him quite eligible candidate to get the perfect position, immortality, back to home, back to Godhead."
(Srila Prabhupada lecture, London, August 22, 1973)