The title quote is from the late Roger Ebert, who was one of America's foremost movie critics and who had more than his share of health issues the last decade of his life.
In an interview with Esquire magazine in 2010 he said, "When I am writing, my problems become invisible."
I think that's true for a lot of people, if we let it.
What breaks the spell is when we think too much about whether it's good enough, what others will think of it, whether it'll be published or produced, whether it's going exactly in the direction we intended.
If we trust the process it can be healing, at least for the time during which we are in its spell.