| John Bartlett (18201905). Familiar Quotations, 10th ed. 1919. |
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| NUMBER: | 3192 |
| AUTHOR: | William Congreve (16701729) |
| QUOTATION: | Defer not till to-morrow to be wise, To-morrows sun to thee may never rise. 1 |
| ATTRIBUTION: | Letter to Cobham. |
| BIOGRAPHY: | Columbia Encyclopedia. |
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