Thousand and One Nights , which we find charming. They pain us, coming from a person whom we love, and thereby enable us to penetrate a little deeper in our knowledge of human nature instead of being content to play upon the surface. Grief penetrates into us and forces us out of painful curiosity to penetrate other people. Whence emerge truths which we feel that we have no right to keep hidden, so much so that a dying atheist who has discovered them, certain of his own extinction, indifferent to fame, will nevertheless devote his last hours on earth to an attempt to make them known.