making someone else more happy

The longer I live and the more experience I have of the world, the more I am convinced that, after all, the one thing that is most worth living for—and dying for, if need be—is the opportunity of making someone else more happy and more useful.

Booker T. Washington

Up from Slavery: An Autobiography. Doubleday, Page & Company, 1907

As quoted in "The Wisdom of Booker T. Washington." by Michael McKinney. Leading Blog. 2/14/2011