T. W. Allies, The Formation of Christendom, Volume II
“ Spiritual jurisdiction being nothing else but the grant to exercise all spiritual powers, two jurisdictions would make two bodies; a thousand would make a thousand; so that the more the Church grew, the more it would be divided, were it not that the root of all its powers in their exercise is one. A spiritual kingdom is absolutely impossible without this unity of jurisdiction; and in virtue of it the whole Church, from north to south and from east to west, was and is one Body in its teaching and its rule ”
