To enjoy good health, one should have water, food and air free from pollution. Now all these three are polluted. Apart from these, man's mind is also polluted. To purify the mind, one should nurture noble and sacred thoughts of service to others. One who does not hurt anybody and has feelings of love and compassion to fellow beings is the greatest of men. "Help ever, hurt never."
(SSS Vol XXVII - Chap 5)