“Criticizing without having the slightest competence on a subject is the first sign of a person's immaturity.”
Original: (it) Criticare senza avere la minima competenza su un argomento è il primo segno di immaturità di una persona.
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Ibn Shu’ba al-Harrani, Tuhaf al-'Uqul, p. 252
Regarding Wisdom

Opening address to the Commonwealth Parliamentary Association conference in Nadi, 6 September 2005.

Fernand Léger - The Later Years, catalogue ed. Nicolas Serota, published by the Trustees of the Whitechapel Art gallery, London, Prestel Verlag, 1988, p. 12
Quotes of Fernand Leger, 1980's

Nobel Prize autobiography (1998)
Context: Bell Labs had been a kind of holy place of solid state physics since the 1950's when it was built up by Shockley after the invention of the transistor. I had no idea at the time of the significance of this placement, but I did notice during my job talk that everybody understood what I was saying immediately — this had never happened before — and that the audience had an irresistible urge to interrupt, heckle, and argue about the subject matter loudly among themselves during the talk so as to lob hand grenades into it, just like back-benchers do in the House of Commons. Being a combative person I rather liked this and lobbed a few grenades of my own to maintain control of my seminar. I later came to understand that this heckling was a sign of respect from these people, that the ability to handle it was a test of a person's worth, and that polite silence from them was an extremely bad sign, amounting to Pauli's famous criticism that the speaker was "not even wrong."

2 Peter 3:44
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Source: Regards sur le monde actuel [Reflections on the World Today] (1931), p. 166

As quoted in Jesus : Myth Or Reality? (2006) by Ian Curtis, p. 289.
Date unknown

“Since I have neither sign nor name
I shall speak only of things unnamed and without sign.”
As quoted in Music of a Distant Drum: Classical Arabic, Persian, Turkish, and Hebrew Poems (2001) by Bernard Lewis, p. 119
Context: I shall grasp the soul's skirt with my hand
and stamp on the world's head with my foot.
I shall trample Matter and Space with my horse,
beyond all Being I shall utter a great shout,
and in that moment when I shall be alone with Him,
I shall whisper secrets to all mankind.
Since I have neither sign nor name
I shall speak only of things unnamed and without sign.