As human beings, we often have desires that are not always consistent with achieving the greatest good for the greatest number of people. Utilitarianism would argue that putting one's desires first and pursuing one's own interests is wrong and immoral behavior. While some moral theories recognize that the pursuit of one's interests can be morally optional, in utilitarianism it is always prohibited (Moral Theory, p. 135). This makes theory overly challenging because you are constantly forced to consider others. Utilitarians can respond to this objection by challenging the claim that the pursuit of one's desires can never be consistent with the greatest good for the greatest number of people. Certainly there may be times when pursuing one's desires is also consistent with producing the greatest good for the greatest number of people. Utilitarians might also point out that moral theories are bound to be challenging because they teach individuals how to act morally, and acting morally is not always a person's desirable course.