"Do not develop ego about your capacities while doing service. Be humble and think that God has given you an opportunity to do service. Whatever you do to others, your feeling must be that you are serving yourself. In fact and in truth, whatever service you are doing to others, you are doing it for yourself….the service that you have done today will be returned to you in future." 

-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

"Evil thoughts cause ill-health. Anxiety, fear and tension also contribute their share. All these result from greed, greed to have more of things, of power and of fame. Greed results in sorrow and despair. Contentment can come only from a spiritual outlook. The desire for worldly goods has to be given up. One should not distinguish between "my work" and "work for God." All work should be worship. Whatever the reward, it is the gift of God. It is for our lasting good. If this attitude is developed, suffering and pain can toughen us and help us to progress towards Divinity."                                                                                  

-Sathya Sai Baba, “Good Health and Goodness” Discourse 30 September 1981

http://www.sssbpt.info/ssspeaks/volume15/sss15-21.pdf