Nothing is more provoking, when we are arguing against a man with reasons and explanations, and taking all pains to convince him, under the impression that we have only to do with his understanding, than to discover at last that he will not understand
 Arthur Schopenhauer, The World as Will and Representation (1819). copy citation

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Author Arthur Schopenhauer
Source The World as Will and Representation
Topic pain explanation
Date 1819
Language English
Reference
Note Translated by R. B. Haldane and J. Kemp
Weblink http://www.gutenberg.org/files/40097/40097-h/40097-h.html

Context

“on the other hand, we say the cold understanding, or to investigate a thing coolly, i.e., to think without being influenced by the will. If we attempt to reverse the relation, and to regard the will as the tool of the intellect, it is as if we made the smith the tool of the hammer. Nothing is more provoking, when we are arguing against a man with reasons and explanations, and taking all pains to convince him, under the impression that we have only to do with his understanding, than to discover at last that he will not understand; that thus we had to do with his will, which shuts itself up against the truth and brings into the field wilful misunderstandings, chicaneries, and sophisms in order to intrench itself behind its understanding and its pretended want of insight.” source