"... every sentence raises a problem, and essentially what you're doing is connecting one sentence to the next. And you write a sentence and you have to figure out what comes next or what doesn't come next."
Says Philip Roth, who's now retired from writing. "It was a constant mental activity, really. And now I just listen, and it's quite nice. I go home and go to sleep... It was on my shoulders all my life, so I really didn't even know it was on my shoulders."
ADDED: When you write a blog, you don't have the struggle of connecting one sentence to the next. The next post comes next, and there needn't be any connection at all.