"I have written so often of how and why it took me so long to write the six books of Earthsea that the story has become like the book you have to read to your four-year-old every night for weeks—You really want to hear it again? Oh well, okay, here goes! I wrote the first three books in five years: ’68, ’70, ’72. I was on a roll. None of them was closely plotted or planned before writing; in each of them much of the story came to me as I followed what I wrote where it inevitably led. I started confidently on the fourth book. The central character was Tenar again, of course, to balance it out. I knew she hadn’t stayed and studied wizardry with Ogion, but had married a farmer and had children, and that the story was going to bring her and Ged back together. But by the middle of the first chapter, I realized that I didn’t know who she was—now. I didn’t know why she’d done what she’d done or what she had to do. I didn’t know her story, or Ged’s. I couldn’t plot or plan it. I couldn’t write it. It took me eighteen years to learn how."
January 1, 1970
https://en.wikiquote.org/wiki/Ursula_K._Le_Guin