Whether we are conscious of it or not most of us worship at the invisible altar of some unknown god and offer sacrifices to it—some ideal, personal, national or international; some distant objective that draws us on, though reason itself may find little substance in it; some vague conception of a perfect man and a better world. Perfection may be impossible of attainment, but the demon in us, some vital force, urges us on and we tread that path from generation to generation.