Philosophy means "love for knowledge". "Knowing by knowing". A knowledge that is not for this or that, but a knowledge that is merely "knowing by knowing", "knowing disinterested" and, therefore, knowing "of all" and "of no one", know "of any other". Therefore, the first answer to our question, what is the purpose of philosophy ?, is that for nothing. And precisely for this reason, from Socrates to Plato, it was thought that it served to govern.