Full Idea
Perception of the special objects of sense is never in error or admits the least possible amount of falsehood.
Gist of Idea
Perception of sensible objects is virtually never wrong
Source
Aristotle (De Anima [c.329 BCE], 428b19)
Book Reference
Aristotle: 'The Basic Works of Aristotle', ed/tr. McKeon,Richard [Modern Library Classics 2001], p.589
A Reaction
This is, surprisingly, the view which was raised and largely rejected in 'Theaetetus'. It became a doctrine of Epicureanism, and seems to make Aristotle a thoroughgoing empiricist, though that is not so clear elsewhere. I think Aristotle is right.