However, as the train rolled on and the landscape flew by, a church once more appeared, this time on the fringe of heaven, some votive chapel perched upon a hill and surmounted by a lofty statue of the Virgin. And once more all the pilgrims made the sign of the cross, and once more Pierre's reverie strayed, a fresh stream of reflections bringing his anguish back to him. What was this imperious need of the things beyond, which tortured suffering humanity? Whence came it? Why should equality and justice be desired when they did not seem to exist in impassive nature? Man had set them in the unknown spheres of the Mysterious, in the supernatural realms of religious paradises, and there contented his ardent thirst for them. That unquenchable thirst for happiness had ever consumed, and would consume him always. If the Fathers of the Grotto drove such a glorious trade, it was simply because they made motley out of what was divine. That thirst for the Divine, which nothing had quenched through the long, long ages, seemed to have returned with increased violence at the close of our century of science. Lourdes was a resounding and undeniable proof that man could never live without the dream of a Sovereign Divinity, re-establishing equality and re-creating happiness by dint of miracles. When man has reached the depths of life's misfortunes, he returns to the divine illusion, and the origin of all religions lies there. Man, weak and bare, lacks the strength to live through his terrestrial misery without the everlasting lie of a paradise. To-day, thought Pierre, the experiment had been made; it seemed that science alone could not suffice, and that one would be obliged to leave a door open on the Mysterious.