To say that a great genius is half-mad, while recognizing his artistic prowess, is worth as much as saying that he was rheumatic, or that he suffered from diabetes. Madness, in fact, is a medical expression to which a balanced critic should pay no more heed than he would to the accusation of heresy brought by the theologian, or to the accusation of immorality brought by the public prosecutor.
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"Realism and Idealism in English Literature (Daniel Defoe - William Blake)," lecture, Università Popolare, Trieste (February 27-28, 1912), printed in James Joyce: Occasional, Critical and Political Writing (2002) edited by Kevin Barry [Oxford University Press, ISBN 0-192-83353-7], p. 179