Reddit reviews Ernest Hemingway on Writing

I first discovered it in this book but I didn't have it on hand so I just googled it as best I could and found that. If it's not exactly the same it's pretty freaking close.

I don't mean to be belligerent, because there is something to the "butt in chair" approach, but editing one's work is a huge way one learns to write better.

To use the Hemingway example, he once gave advice that one should read over everything one has written before writing for that day. (I read that in this book.) If you're working on chapter 1, read through chapter 1. If you're working on chapter 5, don't start at the beginning but read from the start of chapter 5, then read through the whole book once a week, because you want your work to feel not just contiguous but coherent. Maybe I'm saying this because I love the editing process, but I think you're really missing out on writing if you only write.