“Rare are those people who use the mind, few use the heart and really unique are those who use both.”
Source: https://www.frasicelebri.it/frasi-di/rita-levi-montalcini/.
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Rita Levi-Montalcini 15
Italian neurologist 1909–2012Related quotes

“People who think they know everything really annoy those of us who know we don't.”
Bjarne Stroustrup's FAQ: Did you really say that?, 2007-11-15 http://www.stroustrup.com/bs_faq.html#really-say-that,

“Of those who want us to be wrong and those who want us to be right.”

“Those people who think they know everything are a great annoyance to those of us who do.”
As quoted in The Mammoth Book of Zingers, Quips, and One-Liners (2004) edited by Geoff Tibballs, p. 299
General sources
“People who think they know everything are annoying to those of us who do.”
Source: Get A Clue