In the Science of Logic, Hegel argues that thought does not advance by abstract negation—simply cancelling what went before—but by determinate negation. Each moment is superseded in a way that preserves its content while moving to a higher unity. This is the core of Aufhebung: to sublate is at once to cancel, to preserve, and to lift up.

The understanding (Verstand) fixes determinations and holds them apart; reason (Vernunft) grasps their movement and the necessity of their transition. Negation is not empty but concrete: it has a result. That result is the next moment of the concept, which itself will prove one-sided and pass over into its other.

Anyone who treats dialectic as a mere "thesis–antithesis–synthesis" formula misses the speculative character of the negation. The synthesis is not a third thing added from outside; it is the self-unfolding of the concept.