Summary
Writing helps refine thinking by forcing ideas to become more precise and complete. Without writing about a topic, one may not have fully formed ideas about it. Unfolding and probing written claims can lead to deeper understanding and improvement in thinking.
Highlights
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Good thinking is about pushing past your current understanding and reaching the thought behind the thought. This often requires breaking old ideas, which is much easier to do when the ideas are as rigid as they get on the page.