Full Idea
Sense-perception happens without our awareness: whatever we become conscious of is a perception that has already been processed.
Gist of Idea
Perception is unconscious, and we are only conscious of processed perceptions
Source
Friedrich Nietzsche (Writings from Late Notebooks [1887], 34[30])
Book Reference
Nietzsche,Friedrich: 'Writings from the Late Notebooks', ed/tr. Bittner,Rüdiger [CUP 2003], p.1
A Reaction
This seems to me wonderfully perceptive for its date, and a crucial truth, because we have the delusion that we are our consciousness, whereas that is only a tiny part of what we are.