Writing is thinking, but more than that, committing thought to writing is critical for creating thought.

The life expectancy of an unrecorded thought is low.
If you have a thought and you don't write it down, there is a high likelihood that you will forget it, and it will be as if the thought never existed.

A thought can be anything when it’s in your head, tethered to a cloud of neighboring neurons without form. Writing it down forces the probabilities to become discrete.

Putting a thought in writing, therefore, is an act of creation. You are making it real.