Doubt (n.) is, when modest, the beacon of the wise.
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Definition.com
Doubt (n.) is the beacon of the wise.
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Doubt (n.) is a traitor which makes us lose the good we oft might win By fearing to attempt.
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Doubt (n.) is fear, even the littlest, where love is great.
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Doubt (n.) is at once resolved: to be once in doubt is once to be resolved.