Many shelves might be filled with the books which came out in their defence during half a century, and they include the most comprehensive treatises on laws ever written. Nearly all are vitiated by the defect which disfigured political literature in the Middle Ages. That literature, as I have tried to show, is extremely remarkable, and its services in aiding human progress are very great. But from the death of St. Bernard until the appearance of Sir Thomas More's _Utopia_, there was hardly a writer who did not make his politics subservient to the interest of either Pope or King. And those who came after the Reformation were always thinking of laws as they might affect Catholics or Protestants. Knox thundered against what he called _the Monstrous Regiment of Women_, because the Queen went to mass, and Mariana praised the assassin of Henry III. because the King was in league with Huguenots. For the belief that it is right to murder tyrants, first taught among Christians, I believe, by John of Salisbury, the most distinguished English writer of the twelfth century, and confirmed by Roger Bacon, the most celebrated Englishman of the thirteenth, had acquired about this time a fatal significance. Nobody sincerely thought of politics as a law for the just and the unjust, or tried to find out a set of principles that should hold good alike under all changes of religion. Hooker's _Ecclesiastical Polity_ stands almost alone among the works I am speaking of, and is still read with admiration by every thoughtful man as the earliest and one of the finest prose classics in our language. But though few of the others have survived, they contributed to hand down masculine notions of limited authority and conditional obedience from the epoch of theory to generations of free men. Even the coarse violence of Buchanan and Boucher was a link in the chain of tradition that connects the Hildebrandine controversy with the Long Parliament, and St. Thomas with Edmund Burke. That men should understand that governments do not exist by divine right, and that arbitrary government is the violation of divine right, was no doubt the medicine suited to the malady under which Europe languished. But although the knowledge of this truth might become an element of salutary destruction, it could give little aid to progress and reform. Resistance to tyranny implied no faculty of constructing a legal government in its place. Tyburn tree may be a useful thing, but it is better still that the offender should live for repentance and reformation. The principles which discriminate in politics between good and evil, and make States worthy to last, were not yet found.