| John Bartlett (18201905). Familiar Quotations, 10th ed. 1919. |
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| NUMBER: | 9111 |
| AUTHOR: | Diogenes Laërtius (fl. early 3d cent.) |
| QUOTATION: | He said that there was one only good, namely, knowledge; and one only evil, namely, ignorance. |
| ATTRIBUTION: | Socrates. xiv. |
| BIOGRAPHY: | Columbia Encyclopedia. |
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