It's difficult to be rigorous about whether a machine really 'knows', 'thinks', etc., because we're hard put to define these things. We understand human mental processes only slightly better than a fish understands swimming.
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"The Little Thoughts of Thinking Machines", Psychology Today, December 1983, pp. 46–49. Reprinted in Formalizing Common Sense: Papers By John McCarthy, 1990, ISBN 0893915351John McCarthy
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A man of true science... uses but few hard words, and those only when none other will answer his purpose; whereas the smatterer in science... thinks, that by mouthing hard words, he proves that he understands hard things.
Herman Melville
I spent a couple of years between eleven and thirteen analysing the social evaluations that were taken for granted, also acquiring a thorough scepticism about processes regarded as causal, and the consistency of the physical world, as well as the reliability of my own mental processes. By the time I was thirteen I was running out of things to think about, so starting on a run of exam-taking seemed all the more appropriate, as I was finding it difficult to make use of spare time.
Celia Green
Light and matter are both single entities, and the apparent duality arises in the limitations of our language. It is not surprising that our language should be incapable of describing the processes occurring within the atoms, for, as has been remarked, it was invented to describe the experiences of daily life, and these consist only of processes involving exceedingly large numbers of atoms. Furthermore, it is very difficult to modify our language so that it will be able to describe these atomic processes, for words can only describe things of which we can form mental pictures, and this ability, too, is a result of daily experience. Fortunately, mathematics is not subject to this limitation, and it has been possible to invent a mathematical scheme — the quantum theory — which seems entirely adequate for the treatment of atomic processes; for visualisation, however, we must content ourselves with two incomplete analogies — the wave picture and the corpuscular picture.
Werner Heisenberg
What makes a subject difficult to understand — if it is significant, important — is not that some special instruction about abstruse things is necessary to understand it. Rather it is the contrast between the understanding of the subject and what most people want to see. Because of this the very things that are most obvious can become the most difficult to understand. What has to be overcome is not difficulty of the intellect but of the will.
Ludwig Wittgenstein
I will argue that in the literal sense the programmed computer understands what the car and the adding machine understand, namely, exactly nothing.
John Searle
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