It creeps behind your fingers, critiquing every word you write. It whispers behind your thoughts, takes control of your eyes. There! it shouts, jumping up and down. A typo! A misspelled word! Correct it! Correct it now!
You forgot a comma!
A run-on sentence!
No, that character wouldn’t actually say that!
That’s stupid, that doesn’t make sense!
It’s the little voice that is trying to carve details into a chunk of clay before the vase is finished. Those details are just going to be swept away to complete the vase itself, so why focus on them now? Better to start with the vase, then add the details and textures once it’s done. Editing before your scene is complete is like trying to embroider a quilt that hasn’t been sewn yet, or icing a cake that hasn’t been baked.