In this paper I explore the controversial claim that morality exists in the Hobbesian state of nature (represented in the rationality and prudence of natural laws), and how this moral is a necessary condition to achieve civil state. In order to accomplish this objective, I examine the work of G. Kavka on this topic and analize Hobbes’s “reply to the fool”, using game theory. And the end of this paper, At the end of the paper, I make a proposal regarding the necessity and the justification of the transition from one state to the other, emphasizing the weakness of morality in the state of nature to guarantee the fulfillment of natural laws.