Originally I found this on the craftzine blog here. It's a really great little clip, Glass speaks so earnestly about the process of making work (he's speaking specifically of writing, but it can be applied to any media).
He says: "It takes a while. It's going to take you a while. It's normal to take a while. You just have to fight your way through that. Okay? You will be fierce, you will be a warrior, and you will make things that aren't as good as you know in your heart you want them to be. And you will just make one after another."