A less obvious reason to improve your writing, is to improve your thinking. You should think before you write. You should think before you do anything, because it will help you understand what you’re doing, which will help you to do it better. And as someone said, “Writing is nature’s way of showing you how fuzzy your thinking is.” If you think you understand something, and don’t write down your ideas, you only think you’re thinking. To think clearly, you need to be able to write down your ideas clearly, which requires being able to write well.

— Leslie Lamport