You raise one of the points on which I happen to disagree with your respected master, and that is his experiment in the direction of attaining physical immortality. From a scientific standpoint, I would not dare to say that anything is impossible or to set any limits to human achievement; but from a philosophic standpoint I follow the Buddha whose words on this point are as follows: 1) "That which, whether conscious or unconscious, is not subject to decay and death, that you will not find." 2) "No Samana, Brahman nor Mara, nor any being in the Universe can bring about the following five things, namely, `That which is subject to old age, should not grow old; that which is subject to sickness should not be sick; that which is subject to death, should not die; that which is subject to decay should not decay; that which is liable to pass away should not pass away.'*t"
-- Notebooks Category 9: From Birth to Rebirth > Chapter 1: Death, Dying, and Immortality > # 24