From  'Two Prospectors: The Letters of Sam Shepard and Johnny Dark' (via Brain Pickings):

Dear John, 

One thing I realize I love about the ‘letter’ as a form is that it’s conversation; — always available. You can just sit down any old morning & have a conversation whether the person’s there or not. You can talk about anything & you don’t have to wait politely for the other person to finish the train of thought. You can have long gaps between passages — days can go by & you might return & pick it up again. And the great difference in all other forms of writing is that it is dependent to a large extent on the other person. It’s not just a solo act. You’re writing in response to or in relationship to someone else — over time. I think that’s the key — over time. We’re very lucky, I figure, to have continued the desire to talk to each other by mail for something like 40 years. But then again, what else were we going to do? It is probably the strongest through-line I’ve maintained in this life... 

Everything else seems to be broken — except, of course, my other writing which has been with me constantly since about 1963. I’ll never forget the elation of finishing my first one-act play. I felt I’d really made something for the first time. Like the way you make a chair or a tale. Something was in the world now that hadn’t been there before.... 

Another beautiful morning here. Dew on the pasture. Horses grazing. It’s a ‘Kentucky Bluegrass’ postcard. Just a hint of fall in the air, the humidity has lifted & it’s like somebody just pulled a big heavy blanket off yr shoulders.