Help someone in distress and you lighten your own burden; the very joy of alleviating the sorrow of another is the lessening of one's own.
Joy is the happiness of love - love aware of its own inner happiness. Pleasure comes from without, and joy comes from within, and it is, therefore, within reach of everyone in the world.
Many married women who have deliberately spurned the "hour" of childbearing are unhappy and frustrated. They never discovered the joys of marriage because they refused to surrender to the obligation of their state. In saving themselves, they lost themselves!