He was right in saying that the only certain happiness in life is to live for others. At the time his words seemed to me strange, and I did not understand them; but by degrees this became a conviction with me, without thinking about it. He revealed to me a whole new world of joys in the present, without changing anything in my life, without adding anything except himself to each impression in my mind. All that had surrounded me from childhood without saying anything to me, suddenly came to life.
Family Happiness
Leo Tolstoy