"Only a fool learns from his own mistakes. The wise man learns from the mistakes of others."
"One can put some trust in the gratitude of a sovereign, and also in that of his family; under certain conditions, one can even rely upon it; but one can never expect anything from the gratitude of a nation."
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Source: The Quote Verifier : Who Said What, Where, and When. Book by Ralph Keyes, 2006.
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