[ toughness Quotes ]
Showing search results for Toughness Quotes - 2 quotes about toughness - Dictionary Quotes
2 quotesMental toughness is to physical as four is to one.
Competition
Bobby Knight
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Concentration and mental toughness are the margins of victory.
Concentration
Bill Russell
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Research is what I'm doing when I don't know what I'm doing.
[ Research ] Wernher Von Braun