A human being has so many skins inside, covering the depths of the heart. We know so many things, but we don't know ourselves! Why, thirty or forty skins or hides, as thick and hard as an ox's or bear's, cover the soul. Go into your own ground and learn to know yourself there.
Moreover, behind this vague tendency to treat religion as a side issue in modern life, there exists a strong body of opinion that is actively hostile to Christianity and that regards the destruction of positive religion as absolutely necessary to the advance of modern culture.