Start With A Bad First Draft. Then Improve Upon It

I was reading a great book on the overall process of writing just the other day, and one thing that the author said struck me as fascinating. She said that the key to writing was to start free-styling and see what that accomplished for you when you finished. 

The lesson she was teaching was that all great essays, stories, etc., start out as shitty first drafts. There is absolutely nothing wrong with a shitty first draft as long as you read through it and highlight the parts that are worth saving to incorporate into your second draft. I never thought about writing that way. 

The author said that even the great writers use this method because no one can sit down and consistently produce a quality work in just one attempt.