  Classic utilitarianism is consequentialist as opposed to deontological because of what it denies. It denies that moral rightness depends directly on anything other than consequences, such as whether the agent promised in the past to do the act now. Of course, the fact that the agent promised to do the act might indirectly affect the act’s consequences if breaking the promise will make other people unhappy. Nonetheless, according to classic utilitarianism, what makes it morally wrong to break the promise is its future effects on those other people rather than the fact that the agent promised in the past.