| Robert Christy, comp. Proverbs, Maxims and Phrases of All Ages. 1887. | | | | Doubt |
| | | Doubt is the key of knowledge. Persian Sceptic. | 1 |
| He doubts nothing who knows nothing. Portuguese. | 2 |
| He that casteth all doubts shall never be resolved. | 3 |
| He who doubts nothing knows nothing. Spanish. | 4 |
| If you are in doubt of anything dont be ashamed to ask, or if you have committed an error, to be corrected. Erasmus. | 5 |
| In matters of doubt, boldness is of the greatest value. Publius Syrus. | 6 |
Our doubts are traitors And make us lose the good we oft might win By fearing to attempt. Shakespeare. | 7 |
| The end of doubt is the beginning of repose. Petrarch. | 8 |
There lives more faith in honest doubt, Believe me, than in half the creeds. Tennyson. | 9 |
Tis good to doubt the worst. We may in our belief be too secure. Webster and Kowley. | 10 |
| When in doubt decide for the sake of deciding. | 11 |
| Who doubts errs not. | 12 | | |
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