For us, mind has nature for its premise, being nature's truth and for that reason its absolute prius. In this truth nature has vanished, and mind has resulted as the idea arrived at being-for-itself, the object of which, as well as the subject, is the concept. This identity is absolute negativity, for whereas in nature the concept has its perfect external objectivity, this its alienation has been superseded, and in this alienation the concept has become identical with itself. But it is this identity therefore, only in being a return out of nature.
Georg Wilhelm Friedrich Hegel