Sentences are not different enough to hold the attention unless they are dramatic. No ingenuity of varying structure will do. All that can save them is the speaking tone of voice somehow entangled in the words and fastened to the page for the ear of the imagination. That is all that can save poetry from sing-song, all that can save prose from itself.
We disparage reason.
But all the time it's what we're most concerned with.
There's will as motor and there's will as brakes.
Reason is, I suppose, the steering gear.