One has need be a great man, truly, to keep the balance between genius and character. The talent grows, the heart withers.
 Honoré de Balzac, Lost Illusions (1843). copy citation

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

Context

“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. You are slender and fragile, you will give way," he added, as he turned into the restaurant.” source