In this paper I present the HareÂ’s moral philosophy, called Universal Prescriptivism. For Hare, if we are sincerely asking about what ought to do in certain circumstance, then, we are asking for which course of action, between two or more courses, we chose or approve for similar situations. We are asking for a prescription to be applied no matter what individuals are in the same situation, a universal prescription. I try to present and to interpret this aspect as compatible with and plausible for our common sense.