The decrees of the council were shortly afterward (January 26, 1564) ratified by Pius IV, against the wish of the more determined Curialists, while others would have wished him to guard himself by certain restrictions. These were, however, unnecessary, as he reserved to himself the interpretation of doubtful or disputed decrees. This reservation remained absolute as to decrees concerning dogma; for the interpretation of those concerning discipline, Sixtus V afterward appointed a special commission under the name of the "congregation of the Council of Trent." While the former became _ipso facto_ binding on the entire Church, the decrees on discipline and reformation could not become valid in any particular state till after they had been published in it with the consent of its government. This distinction is of the greatest importance. The doctrinal system of the Church of Rome was now enduringly fixed; the area which the Church had lost she could henceforth only recover if she reconquered it. Many attempts at reunion by compromise have since been made from the Protestant side, and some of these have perhaps been met half way by the generous wishes of not a few Catholics; but the Council of Trent has doomed all these projects to inevitable sterility. The gain of the Church of Rome from her acquisition at Trent of a clearly and sharply defined "body of doctrine" is not open to dispute, except from a point of view which her doctors have steadily repudiated. And it is difficult to suppose but that, in her conflict with the spirit of criticism which from the first in some measure animated the Protestant Reformation and afterward urged it far beyond its original scope, the Church of Rome must have proved an unequal combatant had not the Council of Trent renewed the foundations of the authority claimed by herself and of that claimed by her head on earth. The effect of the disciplinary decrees of the council, though more far-reaching and enduring than has been on all sides acknowledged, was necessarily in the first instance dependent on the reception given to them by the several Catholic powers. The representatives of the Emperor at once signed the whole of the decrees of the council, though only on behalf of his hereditary dominions; and he had his promised reward when, a few months afterward (April), the German bishops were, under certain restrictions, empowered to accord the cup in the eucharist to the laity. But neither the Empire through its diet, nor Hungary, ever accepted the Tridentine decrees, though several of the Catholic estates of the Empire, both spiritual and temporal, individually accepted them with modifications. The example of Ferdinand was followed by several other powers; but in Poland the diet, to which the decrees were twice (1564 and 1578) presented as having been accepted by King Sigismund Augustus, refused to accord its own acceptance, maintaining that the Polish Church, as such, had never been represented at the council.