that the words of previous sages should be treated critically, and that they were often contradictory or inconsistent. He criticized scholars of his time for not accepting this, as well as what he called the popular acceptance of written works. He believed that the truth could be discovered, and would become obvious, by making the words clear, and by clear commentary on the text. One example of Wang's rationalism is his argument that thunder must be caused by fire or heat, and is not a sign of the heavens being displeased. He argued that repeatable experience and experiment should be tried before adopting the belief that divine will was involved. He was equally scathing about the popular belief in ghosts. Why should only human beings have ghosts, he asked, not other animals? We are all living creatures, animated by the same vital principle. Besides, so many people have died that their ghosts would vastly outnumber living people; the world would be swamped by them. He never, however, explicitly denies the existence of ghosts (gui 鬼) or spirits (shen 神), he simply separates them from the notion that they are the souls of the dead. He seems to believe that the phenomena exist, but whatever they may be, they have no relation to the deceased. People say that spirits are the souls of dead men. That being the case, spirits should always appear naked, for surely it is not contended that clothes have souls as well as men. (Lunheng) Wang was just as rational and uncompromising about knowledge. Beliefs require evidence, just as actions require results. Anyone can prattle nonsense, and they'll always be able to find people to believe it, especially if they can dress it up in superstitious flummery. Careful reasoning and experience of the world are needed. The Swedish linguist and sinologist Bernhard Karlgren called his style straightforward and without literary pretensions; in general, modern Western writers have noted that Wang was one of the most original thinkers of his time, even iconoclastic in his opinions. They note that he gained popularity in the early 20th century because his ideas correspond to those that later evolved in Europe. His writing is praised for being clear and well ordered. But, because there was no functioning scientific method or larger scientific discourse in his time, his formulations can seem alien to the modern eye — to some readers, even as