What is health? Health is order. And what is order? Order is music. Where there is rhythm, regularity, co-operation, there is harmony, there is sympathy. Health of mind and health of the body depend therefore upon the preserving of that harmony, upon keeping intact that sympathy which exists in the mind and body. Life in the world, and especially as we live it amidst the crowd, will test and try our patience every moment of the day, and it will be most difficult to preserve that harmony and peace which is all happiness. For what is the definition of life? Life means struggle with friends and battle with foes. It is continual giving and taking.