Sensation only occurs through affection by an external sensed object

Evidence

Just as the ‘combustible’, as Aristotle says further, ‘can never ignite itself spontaneously’, sensation cannot be explained except as the affection of the sensory or sentient organ, that is by the action of the sensible, or of the sensed. — Catherine Malabou, The Future of Hegel, 431

Categorization

Category: Causal Relationships