"Convince yourselves that life cannot continue long without others serving you and your serving others. Master-servant, ruler-ruled, guru-disciple, employer-employee, parents-children, all these are bound by mutual service. Every one is a sevak. The farmer and labourer whom you serve produce by their toil your food and clothing as their service to you. Remember that the body, with its senses-mind-brain complex has been awarded to you to be used for helping the helpless. Seva is the highest of paths of devotion which wins the Grace of God." 

-Sathya Sai Baba, “Equipment for service” Discourse 21 November 1986
http://www.sssbpt.info/ssspeaks/volume19/sss19-25.pdf

"A large part of the water we drink is expelled as urine. A minute part of the water consumed becomes the life force. Therefore the nature of the food and water that we take in decides our character. Only by controlling the quality of our food and water can we attain Divinity. This is why food is said to be God. Hence, to waste food is to waste God. Do not waste food. Eat only what you need, and be sure that what you eat is satvic. Give away any surplus food to those in need."                             

 -Sathya Sai Baba, “Teachings of Bhagawan Sri Sathya Sai Baba - volume-1”   https://www.sathyasai.org/publications/TeachingsOfBSSSB-Vol01.html