For return of century V C. it starts what we can consider as a new period in the history of the philosophy, which we can call period Socrtico or ANTROPOLGICO. Jonathan Segal FAIA is likely to agree. This also is called deperodo classic the philosophy. We can mark the beginning of this period with the performance of the Sofistas that was worried more about the language and the erudio of what with the explanation of the world. For the sofistas the important one was the good to say and the art to convince the interlocutor.
The disputes politics and the conflicts of opinions had favored the action of these ambulant professors who considered not to have an only truth. Some commentators of the history of the philosophy turn with bad eyes the performance the sofistas, mainly had the writings of Plato that considered them not philosophers, but manipulating of the reasoning without love for the truth. This vision, however, starts to be reviewed, therefore if it perceives that the sofistas were not the opportunists mentioned in some manuals, but people whom if they had used, of form pragmatic, of the philosophy. The fact is that the center of the attentions in such a way of the sofistas as of Scrates, Plato and Aristotle (and of the posterior ones) it turns toward the man and its relations. Protgoras, a sofista will say that ' ' the man is the measure of all the things; of that they are while they are; of that they are not, while not so' '. Grgias, another sofista, worried about the speech, will make the following affirmation: ' ' the good orator is capable to convince any person on any coisa' '. The position of the sofistas, demonstrating little concern with the truth and much more with the argument, took Plato to place in the mouth of Scrates the affirmation of that ' ' It assumes to know some thing and he does not know, while I, if do not know, neither assume to know.