Sense must coexist with nonsense

Sense must coexist with nonsense, its shadow. A thing is shadowed by another thing because it's shadowed by itself. Recursion points to coexistence in a nonholistic, not-all (which is to say ecological) possibility space. Metalanguages try to escape this possibility space, to reduce the paradox of coexisting: we entail one another and are not one another. Plants, specters, and hallucinations return more vividly when you try to prune them. To distinguish thought from nonsense is like taking a lifeform out of its habitat.

Timothy Morton, Dark Ecology (Columbia University Press, 2016) p.91

Contradiction

Let us suppose that a contradictory entity existed – what could happen to it? Could it lapse into non-being? But it is contradictory, so that even if it happened not to be, it would still continue to be even in not-being, since this would be in conformity with its paradoxical 'essence'. [...] Such an entity would be tantamount to a 'black hole of differences', into which all alterity would be irremediably swallowed up, since the being-other of this entity would be obliged, simply by virtue of being other than it, not to be other than it.

Quentin Meillassoux, After Finitude (Continuum, 2008) pp. 69-70