Therefore, Prichard concludes that just as observation of other people necessitates that other people exist, the observation of a moral obligation necessitates that the obligation exists. Prichard finishes his essay by answering a few obvious problems. Most notably, he explains how people should guarantee the accuracy of their moral intuitions. Clearly, observations can be misleading. For instance, if someone sees a pencil in water, he may conclude that the object in the water is bent. However, when he pulls the pencil from the water, he sees that it is straight. The same can occur with moral intuition. If one begins to doubt one's intuition, one should try to imagine oneself in the moral dilemma related to the decision. If the intuition persists, then the intuition is accurate. Prichard further supports these claims by pointing out how it is illegitimate to doubt previously believed moral intuitions: