this piece in Bloomberg Businessweek about him by Alec McCabe. McCabe's father knew Bradbury and the author wrote Alec some words of encouragement on a science fiction story.
Ray Bradbury . . . had some advice for an aspiring writer during the summer of 1989: “FINISH YOUR NOVEL, START ANOTHER TOMORROW!” he wrote in a paperback copy of “Fahrenheit 451.” “REMEMBER, WRITING IS ALMOST AS MUCH FUN AS SEX!”
I laughed when I read "Finish your novel, start another tomorrow!" because it's the advice I hear from all successful writers, but in a much more succinct way. The sex part -- I guess I still have to work on that.