(1) "Sanitation can often be conveyed effectively by information, but morality cannot be conveyed by telling things." [Sidenote: Teaching morals.] It is certainly true that sanitation can be taught by words. That words concerning moral things have no value is a proposition which Dr. Cabot did not clearly and convincingly support. (2) "People often make sanitary mistakes from ignorance. So far as you are ignorant you cannot be immoral. Morality is conditioned upon knowledge of the right and wrong in question." [Sidenote: Immoral or unmoral.] Of course, one who is ignorant is unmoral and not immoral, but this does not divorce sanitary and moral problems of social disease. An ignorant and unmoral man may have unsanitary sexual habits, but enlighten him regarding venereal disease and his habits make him immoral. (3) "I cannot see that biology has moral value." [Sidenote: Moral value of biology.] But it may have moral influence just as literature and history and biography may have. Of course, pure biology alone will not make people more sexually moral, but no responsible biologist has ever claimed that it will. (4) "In morals, we are dealing with the will, and if we believe that the will is guided by intelligence, we must believe that all people who _know_ what is right will _do_ what is right." [Sidenote: Knowledge and will.] It does not follow that to know what is right is to do what is right. All depends upon the relative weight of opposing factors. A medical student may _know_ the facts regarding venereal disease; but he also knows the fact that his sexual instincts are insistent. The fact of his passion may be more weighty than his scientific knowledge; and his will may be guided by intelligent choice based on comparison of the two opposing facts. Hence, it is illogical to contend that knowledge may not influence moral conduct and that the will is not guided by intelligence. [Sidenote: Cultivation of morality.] (5) "Any good achieved in any branch of morality helps all morality. A person who learns any kind of self control is helped toward all kinds. Anything that helps self control in one field will help in all fields, the field of sex as well as others. Whatever makes a person more obedient to conscience in matters of truth or courage will help him in matters of chastity. We get morality not by consciously cultivating particular virtues, but by making ourselves useful men and women, by practice and by the love and imitation of our betters. Thus, morality is cultivated in hundreds of ways all at once." This is sound, but it is in no logical way opposed to any other aspect of sex-instruction discussed in this series of lectures. (6) "Wherever the conditions of intimacy and interest exist,--intimacy with the right person and interest in the right thing,--moral training is going on." [Sidenote: Influence of individuals.]