Stephen King? Apocryphal?

Question for Quote Investigator: Years ago the famous horror writer Stephen King was discussing how to become a successful artist, and he employed vivid figurative language that I can still recall. He indicated that talent was as common and cheap as table salt. His bracing insight was that success required great effort combined with talent. Would you please help me to find a citation?
Reply from Quote Investigator: In 1981 Stephen King published his analysis of the horror genre emphasizing the years from 1950 to 1980 in the book “Stephen King’s Danse Macabre”. Within the chapter “An Annoying Autobiographical Pause” he discussed the inability of talent by itself to guarantee triumph. Boldface added to excepts by QI:1
I think that writers are made, not born or created out of dreams or childhood trauma—that becoming a writer (or a painter, actor, director, dancer, and so on) is a direct result of conscious will. Of course there has to be some talent involved, but talent is a dreadfully cheap commodity, cheaper than table salt.
King underscored the need for sustained thought and effort:
What separates the talented individual from the successful one is a lot of hard work and study; a constant process of honing. Talent is a dull knife . . .
Discipline and constant work are the whetstones upon which the dull knife of talent is honed until it becomes sharp enough, hopefully, to cut through even the toughest meat and gristle.
Below are additional selected citations in chronological order.
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