"There are three things extremely hard: steel, a diamond, and to know one's self."
— Diamond

January 1, 1970

Quote Details

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Added on April 10, 2026
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MineralsGemstones
Original Language: English

Sources

Benjamin Franklin, in John Maxwell Failing Forward: How to Make the Most of Your Mistakes, Thomas Nelson Inc, 8 March 2000, p. 65.