I've just completed reading a trio of books by Octavia Butler: The Parable of the Sower, The Parable of the Talents, and Bloodchild and Other Stories. The latter contains two essays, Positive Obsession and Furor Scribendi, which I heartily recommend. Replace writer by researcher and everything remains true.
Persistence is essential to any writer--the persistence to finish your work, to keep writing in spite of rejection, to keep reading, studying, submitting work for sale. But stubbornness, the refusal to change unproductive behavior or to revise unsalable work can be lethal to your writing hopes.
Octavia Butler, "Furor Scribendi"