To put it in the pure language of negation: negation is truly the negation of negation, i.e. negation itself is subsumed under its own structure, it itself is negated. {Negation}~{negation} is itself in the structure of negation, this is why negation is doubled upon itself and one must say that negation is negated—absolute negativity. In quality, negation is through excluding its opposite, reality, just as reality is through negating it. In excluding negation, reality is itself negative, and in excluding reality negation is itself real. In that we come to recognize that negation is not a flat opposition of incompatibles where we have one or the other at one moment, but in fact is an immanent self-opposition where the opposite is already within our beginning and part of it, we come to see what absolute negation truly is. Negation is not secondary but a reflexion of the immediate negation that hides it, this immediacy being reality.
The opposite is the opposite of the opposite. A magnet, for example, is the united contradiction of its poles originating in one singular being and real movement which only appears as two incompatible opposites, the positive and negative poles. A whole magnet is the negation of negation, the absolute negation, the negative unity, the difference of the self-same. Absolute negation is the infinite movement which is its own self-repulsion and which in its repulsion finds its unity. Negation is only because it is itself negated by an opposite, so it is only in this constitutive self-relation of the negative. The positive charge is only in that it negates the negative charge and vice versa, and yet these two poles do not destroy each other, but find themselves in one negative unity as the magnet.