“Even a nod from a person who is esteemed is of more force than a thousand arguments or studied sentences from others.”
Life of Phocion
Bartlett's Familiar Quotations, 10th ed. (1919)
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Plutarch 251
ancient Greek historian and philosopher 46–127Related quotes

“More noise occurs from a single man shouting than a hundred thousand who are quiet.”
Hace más ruído un sólo hombre gritando que cien mil que están callados.
100 Masones Su Palabra (2010)

The trial of Charles B. Reynolds for blasphemy (1887)
“How to value my own self-esteem more than the praise of others.”
Four Minute Essays Vol. 7 (1919), A School for Living

“Truth often suffers more by the heat of its defenders than from the arguments of its opposers.”
142
Fruits of Solitude (1682), Part I
Context: Nothing does Reason more Right, than the Coolness of those that offer it: for Truth often suffers more by the heat of its defenders than from the arguments of its opposers.
Source: Hsieh Shie-liang (2020) cited in " Coronavirus could be unkillable: top Taiwanese researcher https://www.taiwannews.com.tw/en/news/3869848" on Taiwan News, 3 February 2020.

Attorney General v. Sillem and others (1864). The Alexandra, 12 W. R. 261.