There are things, then, that we ought to forget, but allowing for these, forgetfulness means forgetting the things which we ought to remember. In alcoholism it is extraordinary how much the person forgets. One cannot fail to be struck by the fact that the alcoholic gets into trouble again and again because he cannot fully remember what happened before. In the field of sex faults this truth is equally obvious. A man is unfaithful to his wife because he allows himself to forget his wife--his memory of her is for the moment blotted out. Nobody could violate his own standards in this field if he could vividly remember them. Hence if we are to help any one else to govern himself in matters of affection we must help him to remember, help him _by planning devices that make it nearly impossible to forget_. Bad temper can ordinarily be explained by forgetfulness. We can hardly lose our temper with a person if we remember the other sides of his nature opposed to that with which we are just now about to quarrel. Nobody consists wholly of irritating characteristics. We all possess them; but we all possess something else besides. Hence if we can realize some of our own moments of wrath, I think we must confess that for the moment the person with whom we were enraged possessed for us but a single characteristic. The rest were forgotten. My account of these five common types of mental deficiency: ignorance, shiftlessness, instability, fears, forgetfulness, is general and vague. I mean to make it so. If my suggestions are of any use to the reader it will be because he is able to make his own specific applications. I want, however, to mention one example of a much more specific fault, namely, _nagging_. In social work we often see families broken up or seriously cracked by some one's nagging. It consists in reminding people of their defects and shortcomings in season and out of season, until the reminder finally gets upon their nerves. You are aware that your husband, your wife, your child, has some very deleterious fault. Admittedly he has it and it is constantly getting him into trouble. So you want to be quite sure that it never gets him into trouble again; and hence you keep reminding him of it again and again until you produce an irritation that only aggravates the original fault.