Perception (n.) is opposed to thinking. When one is looking and seeing, one isn't thinking.
Perception (n.) reaches man, not Callias: you perceive the particular, Aristotle says, yet what registers is the universal.
Perception (n.) decides how far a man may stray before he is blameworthy, not reasoning; such things depend on particular facts.
Perception (n.) is younger than what it perceives: fire and water, the stuff the animal is made of, exist before the animal and its senses.
Perception (n.) is where ethical discrimination finally lies — not a mystic vision but an eye trained by experience to seize what is salient in a new case.
Perception (n.) is the part no teacher can supply: ask the doctor how you will know the feverish patient is pale and he loses patience — if you cannot see that much yourself, there is no use talking.