“You can't write. That's not writing. It's scribbling. Distasteful scribbling. Why can't you write properly?”

The Daring Young Man on the Flying Trapeze (1934), A Cold Day
Context: If you can't write a decent short story because of the cold, write something else. Write anything. Write a long letter to somebody.

Source: Lucky Jim

"A Word to the Wise Guy"
The Adding Machine: Collected Essays (1985)

“National Review Eunuchs,” http://rt.com/op-edge/paleolibertarian-column-ilana-mercer/national-review-john-derbyshire RT, April 13, 2012.
2010s, 2012

Penguins and Golden Calves (2003)
Context: I have advice for people who want to write. I don't care whether they're 5 or 500. There are three things that are important: First, if you want to write, you need to keep an honest, unpublishable journal that nobody reads, nobody but you. Where you just put down what you think about life, what you think about things, what you think is fair and what you think is unfair. And second, you need to read. You can't be a writer if you're not a reader. It's the great writers who teach us how to write. The third thing is to write. Just write a little bit every day. Even if it's for only half an hour — write, write, write.

"A Day of Pleasure" (1996)

(20 July 2007)
Unfit for Mass Consumption (blog entries), 2007
Context: Bad writing days are days when you mean to write and can't, or are interrupted so frequently that nothing gets done. I'm disheartened at how often I see the blogs of aspiring writers bemoaning how slowly a book or story is coming along. They have somehow gotten it in their heads that writing is a thing done quickly, efficiently, like an assembly line with lots of shiny robotic workers. The truth, of course, is that writing is usually slow, and inefficient, and more like trying to find a cube of brown Jello that someone's carelessly dropped into a pig sty. Five hundred words in a day is good. So is a thousand. Or fifteen hundred. A good writing day is a day when one has written well, and the word counts be damned. Finishing is not the goal. Doing the job well is the goal. And I say that as someone with no means of financial support but her writing, as someone who is woefully underpaid for her writing, and as someone with so many deadlines breathing down her neck that she can no longer tell one breather from the other. Sometimes, I forget this, that daily word counts are irrelevant, that writing is not a race to the finish line. One need only write well if one wishes to be a writer. A day when one does not do her best merely so that more may be written, that's a bad writing day.

Source: The City of Dreaming Books