In contrast to the knowledge that keeps man in a passive quietude, Desire dis-quiets him and moves him to action. Born of Desire, action tends to satisfy it, and can do so only by the "negation," the destruction, or at least the transformation, of the desired object: to satisfy hunger, for example, the food must be destroyed or, in any case, transformed. Thus, all action is "negating." Far from leaving the given as it is, action destroys it; if not in its being, at least in its given form. And all "negating-negativity" with respect to the given is necessarily active. But negating action is not purely destructive, for if action destroys an objective reality, for the sake of satisfying the Desire from which it is born, it creates in its place, in and by that very destruction, a subjective reality. The being that eats, for example, creates and preserves its own reality by the overcoming of a reality other than its own, by the "transformation" of an alien reality into its own reality, by the "assimilation," the "internalization" of a "foreign," "external" reality. Generally speaking, the I of Desire is an emptiness that receives a real positive content only by negating action that satisfies Desire in destroying, transforming, and "assimilating" the desired non-I.

Friedrich Hegel, "Autonomy and Dependence of Selfconsciousness: Mastery and Slavery" in Introduction to the Reading of Hegel (Cornell University Press, 1980) p. 4