So deep and meaningful is the joy and the enthusiasm that is born in one's mind and heart by human love and helpfulness that it has the power to motivate for a lifetime. . . . You don't have to be a doctor to say or do that which puts light in a human eye or joy on a human face. Simply practice Jesus' commandment that we love one another. Go out and do something for somebody. These are the things that make happy people. Here is the one never-failing source of the joy and enthusiasm we are talking about.