Since Plato, it has been said that “reason” and “desire” originate in different parts of the human soul, so they play fundamentally different roles. More recently, however, this idea has been called into question under the influence of Freudian theory. Freud divided the psychic apparatus into three parts—ego, id, and super-ego. Indeed, this Freudian distinction is quite similar to the three-part reason, desire, and spirit suggested in Plato’s Republic. The difference, however, is that Freud insisted on there being a direct interaction between reason and desire.Generally, I agree with this notion, allowing that reason as an intellectual act of consciousness is influenced by a kind of desire. Furthermore, reason here essentially includes some impulsive aspects of consciousness. To examine this feature of reason, I will refer particularly to Edmund Husserl’s Ideas 2. In this work, the context in which the human seeks truth as the aim of epistemic activities is expanded from mere intellectual experiences to more practical ones in which the bodily elements of a person play a decisive role.The purpose of this study is to establish a point of view that will enable us to understand intellectual experience as one aspect of the Life World (Lebenswelt) of a psycho-physical person. From this, we will accept the suggestion that we should deal with traditional epistemological problems in an ethical manner.