But (2) all intermediates stand between opposites of some kind; for only between these can change take place in virtue of their own nature (so that an intermediate is impossible between things which are not opposite;
30) Hala ere, bitarteko guztiak dira kontrajarritako batzuen artean, hauetatik bakarrik abiatuz eman baitaiteke aldaketa (horregatik da ezinezkoa kontrajarriak ez direnen arteko bitartekorik, aldaketa kontrajarrietatik abiatu gabe emango litzateke-eta).