“If you attended (a study session) strictly adopt three attitudes; there is no fourth. First: You can lock yourself in the silence of ignorance. Second: If you do not behave as such, ask for the questions a man seeking to learn asks…. This man will ask only about what he does not know, not about what he knows. Asking about matters one knows is making proof of ineptitude; this is only ranting, waste of time for everyone…. If the person you are questioning does not give satisfactory answers, stop questioning… Third: You can answer like a scientist, refuting clearly the other’s arguments. If you are not capable of that, do not insist….””
ibid, 114-5
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Ibn Hazm 27
Arab theologian 994–1064Related quotes
Variant: Ask yourself three questions and you will know who you are. Ask 'What do you believe in? What do you hope for? But most important - ask what do you love?
Source: The Bronze Horseman (2001)

“The question is asked in ignorance, by one who does not even know what can have led him to ask it.”
Preface
1840s, Philosophical Fragments (1844)
Quoted in Craig Modderno, "Newman remains animated at 81," Reuters (2006-06-12)

If it does matter, then you must justify your beliefs; if it doesn’t, then you must justify belief itself.
Source: Faith vs. Fact (2015), p. 63

Il y avait un nombre important de questions que je m'étais posées et, comme vous le savez, lorsqu'on se pose vraiment les questions, on donne de meilleures réponses que si l'on se contente de lire les réponses convenues.
explaining how he came to write his textbook on quantum mechanics, in Descente au coeur de la matière, an interview edited by [Stéphane Deligeorges, Le monde quantique, Editions du Seuil, Sciences et Avenir, 1984, 2020089084, 111]
Source: Leisure, the Basis of Culture (1948), The Philosophical Act, p. 63

47 : The Question and its Answer, p. 78.
The Everything and the Nothing (1963)