To know consists of understanding the conditions under which what it exists it is determined? determination that corresponds to the properties of the beings. The things come to be when a ontolgica relation occurs, between the form that it determines and the substance that is determined. So that some thing exists, the substance must receive a form that becomes it Real, and this elapses of this relation, of this union always necessary and indispensable: form and substance. To understand as this union happens, Aristotle affirms to have more two slight knowledge: the power and the act. The relation between these is essential to the understanding of as a thing comes to be. Into everything what it exists, the act transformed what it was in power. So that it occurs this process is necessary that both are given as a reality and differentiated as cognitivos elements. The knowledge is an activity that it sends of the effect for the cause.

This regressive and upward way, of the final fact to the first cause, is what dialectic flame. The formularization of the systematic deduction is what if it can call science, that corresponds to the order of the being: of the causes to the effect, the generality for the particular one? as science it is the reply of the reasons, it if it defines a deductive knowledge. It is the identification of the causes that defines the knowledge and the more if to approach to the first cause, more raised it will be? reason for which superior science between all it is the Philosophy. The rational function of the human being is superior amongst the college human beings, but it suffers the interference from the desires and the passions. The virtue consists of the domain of the reason on these aspects. The behavior must be under the command of the reason, but, exactly when this happens, if it will not be able to count on the demonstrative text that this gift in the relation that the reason keeps with objects of theoretical knowledge.