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Nothing convinces persons of a weak understanding so effectually, as what they do not comprehend.

Lord Philip Dormer Stanhope Chesterfield, Philip Dormer Stanhope Earl of Chesterfield (1855). “The Works of Lord Chesterfield: Including His Letters to His Son, Etc : to which is Prefixed, an Original Life of the Author”, p.629
Nothing convinces persons of a weak understanding so effectually, as what they do not comprehend.