Writing is Thinking
Remember: Writing is thinking. Without writing, there is no thinking, no progress. The more you write, the more notes you take, and the better of a thinker you become. You’ll read better with better questions in your mind.
From Smart Note Taking:
Writing is not the outcome of thinking; it is the medium in which thought occurs.
Another who says similar things is Tim Ferriss with How to Use Writing to Sharpen Your Thinking. See the transcript Transcript of Tim Ferriss on How to Use Writing to Sharpen Your Thinking