(in Greek : "gnôti sauton", which is better translated by "come to know thyself" or "learn to know thyself") and thus, to become philosophers, that is, according to Plato at least, not specialists of one scholarly branch of knowledge among others, making a living out of their teaching, peer debates and published works, but, in the etymological sense of the word, "lovers of wisdom", lovers (philoi in Greek) only, not "wise" (sophoi in Greek), because they know the wisdom they love cannot be reached in this life (as the principles upon which it depends cannot be demonstrated, which means, as Socrates used to say, that "I know nothing", meaning "I known nothing for certain, in the strongest sense of these words, nothing, that is, of what alone counts to reach happiness in life"), but constitutes an idea(l) of justice, of a justice that is not merely abiding by the laws, but which is the inner harmony to be reached by a human being whose will is torn apart between passions and reason and whose unity is not given from the start, as the foundation for social harmony between men and women in the city.