John Bartlett (1820–1905). Familiar Quotations, 10th ed. 1919.
9174 Diogenes Laërtius fl early 3d ent John Bartlett
| NUMBER: | 9174 |
| AUTHOR: | Diogenes Laërtius (fl. early 3d cent.) |
| QUOTATION: | Protagoras asserted that there were two sides to every question, exactly opposite to each other. |
| ATTRIBUTION: | Protagoras. iii. |