John Bartlett (1820–1905). Familiar Quotations, 10th ed. 1919.
9485 Miguel de Cervantes Saavedra 1547-1616 John Bartlett
| NUMBER: | 9485 |
| AUTHOR: | Miguel de Cervantes Saavedra (1547–1616) |
| QUOTATION: | Make it thy business to know thyself, which is the most difficult lesson in the world. 1 |
| ATTRIBUTION: | Don Quixote. Part ii. Chap. xlii. |
| Note 1. See Chaucer, Quotation 38. [back] |