translation.en: The philosopher Arthur Schopenhauer said that those who don't wonder about the contingency of their existence, of the contingency of the world's existence, are mentally deficient.
translation.zh: 哲学家阿瑟•叔本华曾说， 那些不关心自身存在的偶然性、 以及这个世界存在的偶然性的人， 是心智不健全的。