| C.N. Douglas, comp. Forty Thousand Quotations: Prose and Poetical. 1917. | | | | Mackintosh |
| | | A vice utterly at variance with the happiness of him who harbors it, and, as such, condemned by self-love. | 1 |
| Diffused knowledge immortalizes itself. | 2 |
| Disciplined inaction. | 3 |
| Praise is the symbol which represents sympathy, and which the mind insensibly substitutes for its recollection and language. | 4 |
| Those who differ most from the opinions of their fellow men are the most confident of the truth of their own. | 5 |
| Whatever is popular deserves attention. | 6 | | |
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