Kant believes that all of our actions, whether motivated by inclination or morality, must follow some law. For example, if a person wants to qualify for nationals in ultimate frisbee, he will have to follow a law that tells him to practice his backhand pass, among other things. Notice, however, that this law is only binding on the person who wants to qualify for nationals in ultimate frisbee. In this way, it is contingent upon the ends that he sets and the circumstances that he is in. We know from the third proposition, however, that the moral law must bind universally and necessarily, that is, regardless of ends and circumstances.