1021. But there are numerous other paths, some leading through many years of chastenings, and repeated agitations lasting many years, in fact centuries and thousands of years. Some have winding courses long in distance and time, as do [the foods] that pass into the human mouth: some essences are carried quickly into the brain by a short route; some [foods are taken up] by the veins in the mouth and thence into the blood, some from the stomach, some from the intestines. But these latter, which come into the blood through the chyle, are constantly being chastened, dissolved, and again united.