His naturalism, unlike theirs, was directed mainly against Eleatic skepticism about change and against the denial of "nature" and "natural motion" by Democritus (460–363? BCE) and others. Aristotle aimed to develop and defend natural science as knowledge of what exists "by nature." The nature of a thing, for him, is its power of acting in a particular determinate way, as defined by its end. The study of man is thus continuous with physics, for to study man is to study a specific kind of natural body by seeking out its nature. Man stands within nature, which is an intelligible, teleological order of motions. If Aristotle's philosophy is definitive of classical naturalism, then Democritus would surely qualify as an antinaturalist, despite his materialism, though both are routinely referred to as naturalists by modern writers. "Naturalism" later acquires specifically pejorative connotations in some Platonic, gnostic, and Christian writings, where the natural is contrasted with the spiritual in a way foreign to Aristotle and Democritus alike.
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