3. A guy has a talent that if practiced would make him a useful man but he prefers to give himself up to pleasure rather than working on increasing this talent. His maxim is "Does my maxim of neglecting my natural gifts, besides agreeing with my taste for amusement, agree also with what is called duty?
a) This is cannot be universalized because as a rational being he automatically wills that all his powers should be developed, since they are after all useful to him.
4.A guy believes that he shouldn't help anyone and just worry about himself. Now the human race could survive perfectly well if this was universalized.
a) Although the maxim could be universalized it is impossible to will that such a principle should hold everywhere as a law of nature because it conflicts with itself since many situation might arise in which the man needs love and sympathy from others and in which, by such a law of nature generated by his own will, he would rob himself of all hop of the help he wants.