Barbara Guest in reply to a question about subject matter:
"Oh, yes. The subject matter. The subject matter. I know I was talking to some students in Santa Fe and they were very worried about when I said well what have you been writing, and they said, well, not very much. I realized that they were disturbed more by what they thought was in front of them that they didn’t want to write about, so I told them that the subject matter wasn’t important. And this released them. They were thrilled. They went around for days saying she said the subject doesn’t matter. Because the idea is that sometimes you find the subject as you proceed with the poem. It’s a good rule. It doesn’t always work, but it’s a good rule."
This comes from a transcription recently done of Charles Bernstein's LineBreak interview with Guest in 2005. The full transcript will be published in Jacket2.