In this book we find a "subterrestrial" at work, digging, mining, undermining. You can see him, always provided that you have eyes for such deep work, -how he makes his way slowly, cautiously, gently but surely, without showing signs of the weariness that usually accompanies a long privation of light and air. He might even be called happy, despite his labours in the dark. Does it not seem as if some faith were leading him on, some solace recompensing him for his toil?