What is good writing?

Description of writing is varied by people. However, I believe that definition of writing is refined speaking. When we are speaking, we sometimes tend to talk not in detail but roughly and briefly.
That's why people talk under looking at each other. However, in writing, I think that it is necessary to remark a organization as accurate and refined system. That's why we do not speak directly, while we have to convey our ideas to other people indirectly as a writing. If we do not write a refined organization, many people feel confuse about the writing. Therefore, when I write sentence, I always try to make the refined writing.