The first step in aatma vichara (Self-Enquiry) is the practice of the truth that whatever gives you pain, gives pain to others and whatever gives you joy, gives joy to others.  Desist from any act in relation to others, which, if done to them will give you pain. Thus, a kind of reciprocal relationship will grow between you and others, and gradually you reach the stage when your heart thrills with joy when others are joyful and shudders in pain when others are sad.  This is not the kind of affection towards those who are dear to you or to your kith and kin.  This sharing of joy and grief with everyone will be automatic, immediate, universal.  It is a sign of great spiritual advance.     

- Sri Sathya Sai Speaks, Vol 1, Ch 11, Jul 25, 1958.

"Do unto others, as you would like them to do unto you." - Baba