Blood and Guts in High School (1978)
“The tool that is so dull that you cannot cut yourself on it is not likely to be sharp enough to be either useful or helpful.”
The Technical Tools of Statistics. The American Statistician 34 (1). Online at https://www.jstor.org/stable/2682374
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John Tukey 3
American mathematician 1915–2000Related quotes

“Religion is like a knife: you can either use it to cut bread, or stick in someone's back.”

“That one is so sharp he will cut himself.”
Source: The Dark Is Rising (1965-1977), Silver on the Tree (1977), Chapter 7 “Afanc” (p. 98)

“To act nobly, a noble heart is not enough. It needs help from a sharp mind.”
Looking for an Honest Man (2009)
Context: To act nobly, a noble heart is not enough. It needs help from a sharp mind. Though the beginnings of ethical virtue lie in habituation, starting in our youth, and though the core of moral virtue is the right-shaping of our loves and hates, by means of praise and blame, reward and punishment, the perfection of character finally requires a certain perfection of the mind.

Cambridge Thirty Years Ago.
Literary Essays, vol. I (1864-1890)
“You either die a hero or live long enough to see yourself become the villain.”
Character Harvey Dent

Source: The Tales of Alvin Maker, Alvin Journeyman (1995), Chapter 14.
"Kim Phuc, the napalm girl: 'Love is more powerful than any weapon'" in Irish Times https://www.irishtimes.com/life-and-style/people/kim-phuc-the-napalm-girl-love-is-more-powerful-than-any-weapon-1.2661740 (28 May 1996)