Est profecto animi medicina, philosophia; cuius auxilium non ut in corporis morbis petendum est foris, omnibusque opibus viribus, ut nosmet ipsi nobis mederi possimus, elaborandum est.Philosophy is certainly the medicine of the soul. Its aid is to be sought not from without, as in diseases of the body; and we must labour with all our resources and with all our strength to cure ourselves.Book III, Chapter III; translation by Walter Miller