This comment by user roadside_picnic on how writing is the last step in thinking.
I’ve long considered writing to be the “last step in thinking”. I can’t tell you how many times an idea, that was crystal clear in my mind, fell apart the moment I started writing and I realize there were major contradictions I needed to resolve. Likewise I also have numerous times where writing about something loosely and casually revealed to me something that fundamentally changed how I viewed a topic and really consolidated my thinking.