A very wise physician has said that "every illness has two parts what it is and what the patient thinks about it." What the patient thinks about it is often more important and more troublesome than the real disease. What the patient thinks of life what life means to him is also of great importance and may be the bar that shuts out all real health and happiness. The following pages are devoted to certain ideals of life which I would like to give to my patients the long-time patients who have especially fallen to my lot.They are not all here the steps to health and happiness. The reader may even be annoyed and baffled by my indirectness and unwillingness to be specific. That I cannot help it is a personal peculiarity; I cannot ask any one to live by rule because I do not believe‌that rules are binding and final. There must be character behind the rule and then the rule is unnecessary.All that I have written has doubtless been presented before in better ways by wiser men but I believe that each writer may expect to find his small public his own particular public who can understand and profit by his teachings having partly or wholly failed with the others. For that reason I am encouraged to write upon a subject usually shunned by medical men being assured of at least a small company of friendly readers.I am grateful to a number of friends and patients who have read the manuscript of the following chapters. These reviewers have been frank and kind and very helpful. I am particularly indebted to Dr. Richard C. Cabot who has given me much valuable assistance.