Full Idea
We should make no assertion about the whole when our contact is with the parts.
Gist of Idea
We should say nothing of the whole if our contact is with the parts
Source
report of Epicurus (fragments/reports [c.289 BCE]) by Plutarch - 74: Reply to Colotes 1109e
Book Reference
Plutarch: 'Moralia - vol 14', ed/tr. Einarson,B. /De Lacy P.H. [Harvard Loeb 1967], p.203