"Wherever there is dirt and unclean atmosphere, there will be bad and filthy bacteria, while in a clean place where the atmosphere is good and clean, there will be clean bacteria. When we touch an unclean body, there is a possibility of the disease causing germs flowing into us. Further, that unclean and unsacred body may communicate a part of the uncleanness to us. One body and another are like magnets in this case. This is the reason why individuals who take the path of sadhana, should keep away from unclean surroundings and objects. It is in this context that our ancients have advised that we should go and touch the feet of sacred and elderly people so that the sacredness that is contained in their body is transmitted to us. Similarly, if you touch an unsacred body, the impurity or unsacredness can also enter into you.”

... Sathya Sai Baba, Good Health is Man’s Greatest Wealth,  Summer Showers June 1978 http://www.sssbpt.info/summershowers/ss1978/ss1978-28.pdf

“Avail yourself of every possible occasion to render service to the society. Service need not be limited to individuals. It is important to do national service. You need not seek to know what kinds of service should be done. Whenever you find that you can render help to anyone in need, offer it. Do not make distinctions between rich or poor or the deserving and the undeserving. Offer service according to the needs of the situation."

... Sathya Sai Baba, “The Spirit Of Service” Discourse 21 November 1988 http://www.sssbpt.info/ssspeaks/volume21/sss21-31.pdf