"In order to evolve oneself into a balanced individual, service is an essential quality. This ideal of service has the good quality of removing ego in man. It promotes love and affection. It takes him away from the aspect of worldly attachments and puts him on the path to the divine. This idea of service also explains to him the meaning of divinity. It can give widespread pleasure and bliss for the entire mankind. In fact, service is the first step along the spiritual path." 

-Sathya Sai Baba, “Service To Man Is Service To The Lord” Summer Showers in Brindavan 1973 http://www.sssbpt.info/summershowers/ss1973/ss1973-08.pdf

"How to lead a healthy life? Let Me tell you about My own health. I am sixty eight years old, and believe it or not, My weight since my 14th year of age has been constant at 108 pounds only. It never went up to 109 pounds not came down to 107. You can lead a healthy life once you achieve this kind of balance and moderation. I never eat even a little bit excess. I observe the principle of moderation whether I am invited for food by a millionaire or a pauper. Even though I am sixty eight years, My body is in perfect trim! I do not suffer from aches and My heart is as sound as a rock. There is none who can work like Me and exert himself as much as I do! The secret of My sound health is My regulated food habits. This is how one has to achieve the unity and harmony of food, head and God."

-Sathya Sai Baba, “The Avatar and the devotees” Discourse 23 November 1994

http://www.sssbpt.info/ssspeaks/volume27/sss27-31.pdf