This is the true joy in life, the being used for a purpose recognized by yourself as a mighty one, the being thoroughly worn out before you are thrown on the scrap heap, the being a force of nature instead of a feverish little clod of ailments and grievances complaining that the world will not devote itself to making you happy.

George Bernard Shaw

Life becomes harder for us when we live for others, but it also becomes richer and happier.

Albert Schweitzer