“Be careful about your physical health. Satisfy the demands of nature; the car must be given the petrol that it needs. Otherwise, your head might reel and your eyes might get blurred through sheer exhaustion. How can thoughts of the Lord be stabilised in a weak frame? Only, do not forget the purpose of this body when you are tending it… that you have come embodied so that you might realise the end of this cycle of birth and death.” 

…Sathya Sai Baba, SSS01, Chapter 5, “ Meditation on the Lord’s Form and Name”, Divine Discourse, Chitravati River Bed Puttaparthi, 23 Feb 1958

https://www.sssbpt.info/ssspeaks/volume01/sss01.pdf

“Men are not aware that time sanctified by service offers high rewards to themselves as well as those whom they serve. All acts of service are not equally sanctifying or uniform in the benefits they confer. When service is undertaken by power-hungry people, or under compulsion or by imitative urges, it results in more harm than good. Self-aggrandizement or competition or ostentation are motives that will pollute the sacred Sadhana of Service. The candidate for this Sadhana has to avoid Ahamkara (egoism), Adamabara (exhibitionism) and Abhimana (attachment).”

…Sathya Sai Baba, “Equipment for Service” Discourse, 21 November 1986

 http://www.sssbpt.info/ssspeaks/volume19/sss19-25.pdf