Sri Aurobindo
Letters of Sri Aurobindo
Volume I - Part 3
Fragment ID: 10399
There can be no immortality of the body without supramentalisation; the potentiality is there in the Yogic force and Yogis can live for 200 or 300 years or more, but there can be no real principle of it without the Supramental.
Even Science believes that one day death may be conquered by physical means and its reasonings are perfectly sound. There is no reason why the Supramental Force should not do it. Forms on earth do not last (they do in other planes) because these forms are too rigid to grow expressing the progress of the spirit. If they become plastic enough to do that, there is no reason why they should not last.