What is the most important thing about good writing?

I would like to open up a discussion about writing and hear what other writers have to say. What is the most important thing you have learned since you started writing or blogging? Blogging IS writing, as far as I am concerned. The elements are all there: making sure your sentence structure is correct, that you have good grammar and punctuation, that you say something meaningful and helpful, and that you edit, edit, edit! I will start it off.

The most important thing I have learned about writing is that you should listen to your instincts when you get a critique. Everyone has an opinion, but follow your heart. Listen and learn, but don’t let anyone dictate your story. So the floor is open, wide open. Tell us what the most important thing you have learned about writing.