I probably spend about as much time reading my words aloud as I do typing them into my computer. We may think we read books only with our eyes, but the mental circuitry of language connects to our ears. The ancient Sufi poets sometimes spoke of sifting the sands of a beach with one’s eyelashes to remove the pebbles of imperfection. That’s what reading aloud lets a writer do. It takes a lot of work and you can never remove all the pebbles, but it’s still the best way of gauging writing-in-progress that I know.
And, while we're at it, of Flaubert, who "once complained that his throat hurt — from too much writing."