| John Bartlett (18201905). Familiar Quotations, 10th ed. 1919. |
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| NUMBER: | 3302 |
| AUTHOR: | Edward Young (16831765) |
| QUOTATION: | At thirty, man suspects himself a fool; Knows it at forty, and reforms his plan. |
| ATTRIBUTION: | Night Thoughts. Night i. Line 417. |
| BIOGRAPHY: | Columbia Encyclopedia. |
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