Full Idea
Mind must never reject the senses, because that is where it gets its evidence, and it would be the mind's downfall.
Gist of Idea
All evidence comes from senses, so they are indispensable to the mind
Source
Democritus (fragments/reports [c.431 BCE], B125), quoted by Galen - On Medical Experience 15.8
Book Reference
'Ancilla to the Pre-Socratic Philosophers', ed/tr. Freeman,Kathleen [Harvard 1957], p.104