“Two signs of learned person are: acceptance of other people's criticism, and being knowledgeable about the angles and dimensions of rhetoric and debate.”
Ibn Shu’ba al-Harrani, Tuhaf al-'Uqul, p. 252
Regarding Wisdom
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Husayn ibn Ali 32
The grandson of Muhammad and the son of Ali ibn Abi Talib 626–680Related quotes

Source: Quotes 1990s, 1995-1999, The Common Good (1998)
“There are three signs of a knowledgeable person: knowledge, forbearance and silence.”
Majlisi, Bihārul Anwār, vol. 2, p. 59.
Regarding Knowledge & Wisdom, General
Source: 1960s, Beyond Economics: Essays on Society, 1968, p. 142
Source: The Knowledge-creating Company, 1995, p. 95

Original: (it) Criticare senza avere la minima competenza su un argomento è il primo segno di immaturità di una persona.
Source: prevale.net
"The work is not the performance", Companion to Medieval & Renaissance Music. (1997). Oxford University Press. ISBN 0198165404.

1990s, I Am a Man, a Black Man, an American (1998)