For [Georg Wilhelm Friedrich] Hegel, ancient skepticism preserved the essence of the skeptical principle, and the tropes express this principle. In the earlier ten tropes, there is, according to Hegel, a lack of abstraction that becomes obvious in the fact that their diversity could be grasped under more general points of view. […] Sextus [Empiricus] explains that the first four tropes are based on the judging subject; these deal with the differences among animals, the differences among human beings, the differences that distinguish the various senses, and, finally, circumstantial differences.