This condition was extended for good time, but no longer century XX the recognition of the value of the philosophy was established as important source of knowledge, not being able the man to ignore it, has seen that it is not pleased only with the fragmented knowledge of the reality that science offers to it, because it does not only live to satisfy its physical and biological necessities; it needs feeding its spirit, recognizing and preserving moral and ethical values (some of the problems investigated for the philosophy) they lead that it to the harmony, the peace and the practical one of the virtues. There they are, resumidamente, the three main sources of knowledge that so far permearam the trajectory of the humanity. The myths, having been the first one of them, and although today to be able to point its deficiencies, of the point of view of the true knowledge, it has that if to recognize, however, that, in the historical period where appeared, it consisted in something extraordinary for the humanity then, even because the cognoscitivas ambitions of this were modest. Sedento of explanations mainly for the phenomena surrounded that it, the man found in mythology an excellent source to saciar its curiosity. Source wanted to know more. The philosophy resulted of the insatisfao of some inhabitants of Old Greece, more ambitious and unsatisfied with the explanations of the reality, supplied for mythology. They wanted something more consistent of what the simple existence of deuses powerful, of whose wills depended the events on the world and the life of the people. It marked an extraordinary and definitive advance for the humanity, for having developed knowledge of universal abrangncia, whose validity has not only resisted the time, as served of base to develop other knowledge of scientific matrix, in the area of the humanities, and each time more is affirmed as legitimate and indispensable. .