Someone who has thought rationally and deeply about how the body works is likely to arrive at better ideas about how to be healthy than someone who has followed a hunch. Medicine presupposes a hierarchy between the confusion the layperson will be in about what is wrong with him, and the more accurate knowledge available to doctors reasoning logically. At the heart of Epicureanism is the thought that we are as bad at answering the question "What will make me happy?" as "What will make me healthy?" Our souls do not spell out their troubles.