| C.N. Douglas, comp. Forty Thousand Quotations: Prose and Poetical. 1917. | | | | Obduracy |
| | | A callousness and numbness of soul. Bentley. | 1 |
| Distends with pride, and hardening in his strength. Milton. | 2 |
| There is no flesh in mans obdurate heart; he does not feel for man. Cowper. | 3 |
| Argument does not soften, but rather hardens, the obdurate heart. Dewey. | 4 |
| Fattened in vice, so callous and so gross, he sins and sees not, senseless of his loss. Dryden. | 5 |
| God may, by almighty grace, hinder the absolute completion of sin in final obduracy. South. | 6 | | |
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