| John Bartlett (18201905). Familiar Quotations, 10th ed. 1919. |
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| NUMBER: | 9162 |
| AUTHOR: | Diogenes Laërtius (fl. early 3d cent.) |
| QUOTATION: | One ought to seek out virtue for its own sake, without being influenced by fear or hope, or by any external influence. Moreover, that in that does happiness consist. 1 |
| ATTRIBUTION: | Zeno. liii. |
| BIOGRAPHY: | Columbia Encyclopedia. |
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