John Bartlett (1820–1905). Familiar Quotations, 10th ed. 1919.
9010 Marus Aurelius 121-180 John Bartlett
| NUMBER: | 9010 |
| AUTHOR: | Marcus Aurelius (121–180) |
| QUOTATION: | Nothing has such power to broaden the mind as the ability to investigate systematically and truly all that comes under thy observation in life. |
| ATTRIBUTION: | Meditations. iii. 11. |