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- – The secret of success is constancy of purpose.
- – The Works of Benjamin Disraeli: Endymion, v. 2. Miscellanea – Página 109, Benjamin Disraeli (Earl of Beaconsfield), Edmund Gosse, Robert Arnot – Printed for subscribers only by M. W. Dunne, 1904
- – The secret of success is constancy of purpose.
Benjamin Disraeli
