I heard a lecture yesterday by Fran Skiles, a textile and collage artist. Her work is nothing like I would ever create, but I found her comments on the creative process, its anxieties and rewards, to ring true.
Towards the end of her talk, she was asked if sometimes things just didn't come out right. She gave an unexpected response: "I believe in ruining work. But I wasn't getting anywhere!" The whole audience, familiar with trying to balance perfection against the need to grow as an artist, laughed with her.