I'm reading Lawrence Block's memoir, in which he recalls his experience of writing rapidly. And it goes:
"Some of us are apt to describe a book as having virtually written itself, but that’s not really what happens; if it did, one wouldn’t feel so utterly exhausted at day’s end. But, tiring or not, I’ve had books that were written very rapidly, and I don’t know that they ever suffered for the speed of their composition. Some of the work I’ve liked the best, and that was the most favorably received, had a very short gestation period and an easy birth."
I'm confused about what "I don't know" and "suffer for" mean here. Is he actually saying that "I don't think writing rapidly did any harm to my work"?