“A theory of knowledge is an answer to the question "What is knowledge?" This question, like many which are asked by philosophers, sounds very simple. We all know, at least roughly, what knowledge is. But difficulties appear the moment that we begin to fill in the details.”

—  David Pears

What is Knowledge? (1971)

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“The Doctrine of Knowledge, apart from all special and definite knowing, proceeds immediately upon Knowledge itself, in the essential unity in which it recognises Knowledge as existing; and it raises this question in the first place — How this Knowledge can come into being, and what it is in its inward and essential Nature?”

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I.
Outline of the Doctrine of Knowledge (1810)
Context: The Doctrine of Knowledge, apart from all special and definite knowing, proceeds immediately upon Knowledge itself, in the essential unity in which it recognises Knowledge as existing; and it raises this question in the first place — How this Knowledge can come into being, and what it is in its inward and essential Nature?
The following must be apparent: — There is but One who is absolutely by and through himself, — namely, God; and God is not the mere dead conception to which we have thus given utterance, but he is in himself pure Life. He can neither change nor determine himself in aught within himself, nor become any other Being; for his Being contains within it all his Being and all possible Being, and neither within him nor out of him can any new Being arise.

“Knowledge brings more questions than answers”

Carlos Gershenson (1978) Mexican researcher

Quote in: Carlos Gershenson (2007) Design and Control of Self-organizing Systems. p. 144
However Eduardo Gianetti (2001) Lies We Live By: The Art of Self Deception p. 136 stated:
Laplace's omniscient intelligence transcends the human condition and, what's more serious, seems to get ever more and more out of reach, as the advance of scientific knowledge brings more questions than answers.
Misattributed
Variant: Knowledge brings more questions than answers

“How does the philosophical question differ from the non-philosophical question? To philosophize means, we said, to direct one's view toward the totality of the world. So is that a philosophical question (and that alone) which has for its explicit and formal theme the sum-total of all existing things? No! What is peculiar and distinctive about a philosophical question is that it cannot be posed, considered, or answered (so far at least as an answer is possible) without "God and the world" also coming into consideration, that is, the whole of what exists.”

Josef Pieper (1904–1997) German philosopher

Since "the answers of the special sciences" do not reach "the horizon of total reality", they are given "without having to speak at the same time of 'God and the world.'" (p. 96)
Source: Leisure, the Basis of Culture (1948), The Philosophical Act, p. 95

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Howard Becker (1974). "Art as Collective Action." American Sociological Review 39:767-76.

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