Because it is equivalent to denying all the changes in nature that anyone can see for themselves. He must have been ridiculed by many people. And Empedocles must have been very clever when he proved that the world had to consist of more than one substance. That makes all the changes of nature possible without anything actually changing. LA dodgers 2020 champions ugly christmas sweater. The ancient Greek philosopher had come up with that only by reason. Of course, he studied nature. But he did not have the tools for chemical analysis like modern scientists do.