Where Do Sentences Come From? - NYTimes.com

"Experiment a little. Make a sentence of your own in your head. Don’t write it down. Any kind of sentence will do, but keep it short. Rearrange it. Reword it. Then throw it out. Make another. Rearrange. Reword. Discard. You can do this anywhere, at any time. Do it again and again, without inscribing anything. Experiment with rhythm. Let the sentences come and go. Evaluate them, play with them, but don’t cling to them. If you find a sentence you really like, let it go and look for the next one. The more you do this, the easier it will be to remember the sentences you want to keep. Better yet, you’ll know that you can replace any sentence you lose with one that’s just as good.

. . . [You'll] learn to write well, to trust yourself as a writer, you will have to learn to be patient in the presence of your own thoughts. You’ll learn that making sentences in your head will elicit thoughts you didn’t know you could have. Thinking patiently will yield far better sentences than you thought you could make.

You’ll discover the most important thing your education left out: how to trust and value your own thinking. And you’ll also discover one of things writing is for: pleasure."  - VERLYN KLINKENBORG