Full Idea
Why is there not also a sense of the senses themselves? And why don't the senses produce sensation without external bodies, since they contain elements?
Gist of Idea
Why can't we sense the senses? And why do senses need stimuli?
Source
Aristotle (De Anima [c.329 BCE], 417a03)
Book Reference
Aristotle: 'De Anima (On the Soul)', ed/tr. Lawson-Tancred,H.C. [Penguin 1986], p.169