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Charles Dickens: There is no substitute for thorough-going, ardent, and sincere earnestness.

There is no substitute for thorough-going, ardent, and sincere earnestness.
Charles DickensSourced
Source
From the book David Copperfield (London: Bradbury & Evans, 1850), Ch. XLII: "Mischief", p.429., Charles Dickens, David Copperfield (London: Bradbury & Evans, 1850), Ch. XLII: "Mischief", p.429.

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