Genius is a cruel disease. Every writer carries a canker in his heart, a devouring monster, like the tapeworm in the stomach, which destroys all feeling as it arises in him. Which is the stronger? The man or the disease?
 Honoré de Balzac, Lost Illusions (1843). copy citation

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Author Honoré de Balzac
Source Lost Illusions
Topic genius heart
Date 1843
Language English
Reference
Note Translated by Ellen Marriage
Weblink https://www.gutenberg.org/cache/epub/13159/pg13159.html

Context

“When he shook hands with the one journalist who had not been hostile to him, it was with a cruel pang in his heart. "What shall I do?" he asked aloud. "One must do as one can," the great critic said. "Your book is good, but it excited jealousy, and your struggle will be hard and long. Genius is a cruel disease. Every writer carries a canker in his heart, a devouring monster, like the tapeworm in the stomach, which destroys all feeling as it arises in him. Which is the stronger? The man or the disease? One has need be a great man, truly, to keep the balance between genius and character. The talent grows, the heart withers. Unless a man is a giant, unless he has the thews of a Hercules, he must be content either to lose his gift or to live without a heart.” source