The solution that Aristotle also considered consisted of ' ' dualismo' ': the separation between the sensible dimension and the intelligible one. However, it entered in conflict with the idea of its master and formed another relation between the two worlds. One is not about the relation between the sensible world and the intelligible one, and yes, to establish the relation between the reality sensible? multiple, changeable? the intelligible conditions of its knowledge. The reason of being of the sensible things, does not coincide with really existing essences. The sensible world is not the world of the shades, is the real world, but if it cannot find that this sensible dimension, of being real, constitutes knowledge. In this manner, it considers that intelligible world is opposing to the sensible world. Aristotle is the founder of the logic. The logic possesss the principles most basic for coherence and everything what it is necessary to characterize the true one, without leaving of side the sensation, that still is the only real thing that we possess to arrive at the discovery process.

The changes that occur in the sensible world cannot be considered the ticket of the being when not-being. In this process, the being, can remain steady, thus finding, a justification for the sensible reality. The directions are the categoriais possibilities? logical elements of determination and joint? that they are articulated in the reality, and everything what exists can be known through the relation enters, substance and the accidental attributes. The funny thought of Aristotle around making with that a correspondence between the knowledge and the reality exists. Substance is the essence, the possibility of determination of the being, and the knowledge is what the thing possesss for necessity. Aristotle affirms that we must look the determination of the things, that is, to look for to always know for the causes, that is the determinative element of the things, the reason of being.