“Doubt about the fact that insight wholesomeness consists of simply observing the presently arising mental and physical phenomena is also skeptical doubt. This doubt is so subtle that it is rarely detected but is instead mistaken for investigation. This doubt masquerades as analytical knowledge. The commentary on Netti Yuttihāra explains as follows: "Doubt appears in the guise of investigation."”
Source: Manual of Insight (1945), p. 64
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Mahasi Sayadaw 13
Burmese Buddhist philosopher 1904–1982Related quotes

Why I Am An Agnostic (1929)
Source: Why I Am An Agnostic and Other Essays

“Doubt is the offspring of knowledge: the savage never doubts at all.”
Source: The Martyrdom of Man (1872), Chapter II, "Religion", p. 189.

The Ethics of Belief (1877), The Limits Of Inference
Context: p>We may believe what goes beyond our experience, only when it is inferred from that experience by the assumption that what we do not know is like what we know. We may believe the statement of another person, when there is reasonable ground for supposing that he knows the matter of which he speaks, and that he is speaking the truth so far as he knows it.It is wrong in all cases to believe on insufficient evidence; and where it is presumption to doubt and to investigate, there it is worse than presumption to believe.</p

““I frankly doubt that.”
“Ah. That is your privilege. But doubt doesn’t alter fact, sir.””
Book 2, Chapter 2 (p. 124)
Downbelow Station (1981)