“I feel that every time I write a page either of prose or of verse, with real effort, even if it's thrown into the fire the next minute, I am so much further on.”
“Instead of telling us a thing was “terrible,” describe it so that we'll be terrified. Don't say it was “delightful”; make us say “delightful” when we've read the description. You see, all those words (horrifying, wonderful, hideous, exquisite) are only like saying to your readers, “Please will you do my job for me.””
“Don't use words too big for the subject. Don't say 'infinitely' when you mean 'very'; otherwise you'll have no word left when you want to talk about something really infinite.”