It is important to reconsider the question of the utility of philosophy.
For this question, it is necessary to answer while showing how much it is necessary to make philosophy, to have a philosophy and to live with philosophy. Because it appears that the man is itself when it wakes up with the conscience, when he can act in the world, when he has a philosophy of his action enabling him to found this one, and finally, when he lives fully by living with others, with art, virtue and faith.
Remain nevertheless that all was not known as on the utility of philosophy. To require of what is useful philosophy is not always the fact of the sincere interrogation.
It is also that of the silly thing, spite and violence.
In the myth of the cave, Plato (428-348 front. J.-C.)
in gives the reasons (seeAristote and the universal one).

Of the primary education man to the adult man

One can, known asPlato in substance, food in two ways in an adult way and a primary way. The adult is that which, by definition, seeks to see broad, further that the end from his nose. So it does not try all to bring back to him, all to reduce so that it can handle and it says more readily "I have very to learn" than "I know".
Conscious that the life is rich, beautiful, astonishing, distressing sometimes as, it is aware as there is something to find giving to the life a raison d'être.
It is what Plato indicates under the name of heart, this dialogue infinite of oneself with the life giving life and direction to all. When it was understood that this heart it is the life, one can die serene like Socrate (470-399 front. J.-C.), having tested in oneself that there is something which escapes from disappearance from the body. And consequently, delivered anguish of death, one can live merry.
In opposition to that, the primary education man is that which does not exceed the end of his nose. Wishing all to bring back to him, all to handle with the liking of his phantasms while saying "I know", the thought seems useless to him, vain wisdom and the depth of the things a pure illusion.
For him, only account triumph of its ego through handling and the profit which it can draw from the things. Also it sows misfortune around him.

One of these misfortunes is that one can without reddening shame to put the question: " With what is used philosophy? "Vis-a-vis with this misfortune, philosophy is our only means of fighting against cruelty has technical face.
It teaches us that is not with philosophy to serve the world, but in the world to serve philosophy, as well it is true as the man grows himself in the infinite dialogue which it has with the life and not while becoming a predator plundering the existence, because, one, "it say has only that of truth there! ". Looking at nature, Hobbes (1588-1679) noted that the man is a wolf for the man there. Looking at wisdom, Spinoza (1632-1677) observed that the man becomes a god for the man there. This is why Aristote (384-322 front. J.-C.) and Hegel (1770-1831) have opposes the idea that the life is thought of that establishing that it is not that one is delirious. That in order to recall that the life really starts with the thought which makes it live, if one wants "to make the man well" and to give him the dignity which it seeks.