He was less apprehensive than most of his English friends in questions relating to the Old Testament; and in the New, he was disposed, at times, to allow some force to Muratori's fragment as to the person of the evangelist who is least favourable to St. Peter; and was puzzled at the zeal of the Speaker's commentator as to the second epistle of the apostle. He held to the epistles of St. Ignatius with the tenacity of a Caroline prelate, and was grateful to De Rossi for a chronological point in their favour. He rejected the attacks of Lucius on the most valued passages in Philo, and stood with Gass against Weingarten's argument on the life of St. Anthony and the origin of Monasticism. He resisted Overbeck on the epistle to Diognetus, and thought Ebrard all astray as to the Culdees. There was no conservative antiquarian whom he prized higher than Le Blant: yet he considered Ruinart credulous in dealing with acts of early martyrs. A pupil on whose friendship he relied, made an effort to rescue the legends of the conversion of Germany; but the master preferred the unsparing demolitions of Rettberg. Capponi and Carl Hegel were his particular friends; but he abandoned them without hesitation for Scheffer Boichorst, the iconoclast of early Italian chronicles, and never consented to read the learned reply of Da Lungo.
The Pope Fables carried the critical inquiry a very little way; but he went on with the subject. After the Donation of Constantine came the Forged Decretals, which were just then printed for the first time in an accurate edition. Döllinger began to be absorbed in the long train of hierarchical fictions, which had deceived men like Gregory VII., St. Thomas Aquinas, and Cardinal Bellarmine, which he traced up to the false Areopagite, and down to the Laminæ Granatenses. These studies became the chief occupation of his life; they led to his excommunication in 1871, and carried him away from his early system. For this, neither syllabus nor ecumenical council was needed; neither crimes nor scandals were its distant cause. The history of Church government was the influence which so profoundly altered his position. Some trace of his researches, at an early period of their progress, appears in what he wrote on the occasion of the Vatican Council, especially in the fragment of an ecclesiastical pathology which was published under the name of Janus. But the history itself, which was the main and characteristic work of his life, and was pursued until the end, was never published or completed. He died without making it known to what extent, within what limit, the ideas with which he had been so long identified were changed by his later studies, and how wide a trench had opened between his earlier and his later life. Twenty years of his historical work are lost for history.
The revolution in method since he began to write was partly the better use of old authorities, partly the accession of new. Döllinger had devoted himself to the one in 1863; he passed to the other in 1864. For definite objects he had often consulted manuscripts, but the harvest was stacked away, and had scarcely influenced his works. In the use and knowledge of unpublished matter he still belonged to the old school, and was on a level with Neander. Although, in later years, he printed six or seven volumes of Inedita, like Mai and Theiner he did not excel as an editor: and this part of his labours is notable chiefly for its effect on himself. He never went over altogether to men like Schottmüller, who said of him that he made no research—er hat nicht geforscht—meaning that he had made his mind up about the Templars by the easy study of Wilkins, Michelet, Schottmüller himself, and perhaps a hundred others, but had not gone underground to the mines they delved in. Fustel de Coulanges, at the time of his death, was promoting the election of the Bishop of Oxford to the Institute, on the ground that he surpassed all other Englishmen in his acquaintance with manuscripts. Döllinger agreed with their French rival in his estimate of our English historian, but he ascribed less value to that part of his acquirements. He assured the Bavarian Academy that Mr. Freeman, who reads print, but nevertheless mixes his colours with brains, is the author of the most profound work on the Middle Ages ever written in this country, and is not only a brilliant writer and a sagacious critic, but the most learned of all our countrymen. Ranke once drew a line at 1514, after which, he said, we still want help from unprinted sources. The world had moved a good deal since that cautious innovation, and after 1860, enormous and excessive masses of archive were brought into play. The Italian Revolution opened tempting horizons. In 1864 Döllinger spent his vacation in the libraries of Vienna and Venice. At Vienna, by an auspicious omen, Sickel, who was not yet known to Greater Germany as the first of its mediæval palæographers, showed him the sheets of a work containing 247 Carolingian acts unknown to Böhmer, who had just died with the repute of being the best authority on Imperial charters. During several years Döllinger followed up the discoveries he now began. Theiner sent him documents from the Archivio Segreto; one of his friends shut himself up at Trent, and another at Bergamo. Strangers ministered to his requirements, and huge quantities of transcripts came to him from many countries. Conventional history faded away; the studies of a lifetime suddenly underwent transformation; and his view of the last six centuries was made up from secret information gathered in thirty European libraries and archives. As many things remote from current knowledge grew to be certainties, he became more confident, more independent, and more isolated. The ecclesiastical history of his youth went to pieces against the new criticism of 1863, and the revelation of the unknown which began on a very large scale in 1864.
During four years of transition occupied by this new stage of study, he abstained from writing books. Whenever some local occasion called upon him to speak, he spoke of the independence and authority of history. In cases of collision with the Church, he said that a man should seek the error in himself; but he spoke of the doctrine of the universal Church, and it did not appear that he thought of any living voice or present instructor. He claimed no immunity for philosophy; but history, he affirmed, left to itself and pursued disinterestedly, will heal the ills it causes; and it was said of him that he set the university in the place of the hierarchy. Some of his countrymen were deeply moved by the measures which were being taken to restore and to confirm the authority of Rome; and he had impatient colleagues at the university who pressed him with sharp issues of uncompromising logic. He himself was reluctant to bring down serene research into troublesome disputation, and wished to keep history and controversy apart. His hand was forced at last by his friends abroad. Whilst he pursued his isolating investigations he remained aloof from a question which in other countries and other days was a summary and effective test of impassioned controversy. Persecution was a problem that had never troubled him. It was not a topic with theoretical Germans; the necessary books were hardly available, and a man might read all the popular histories and theologies without getting much further than the Spanish Inquisition. Ranke, averse from what is unpleasant, gave no details. The gravity of the question had never been brought home to Döllinger in forty years of public teaching. When he approached it, as late as 1861, he touched lightly, representing the intolerance of Protestants to their disadvantage, while that of Catholics was a bequest of Imperial Rome, taken up in an emergency by secular powers, in no way involving the true spirit and practice of the Church. With this light footfall the topic which has so powerful a leverage slipped into the current of his thought. The view found favour with Ambrose de Lisle, who, having read the Letters to a Prebendary, was indignant with those who commit the Church to a principle often resisted or ignored. Newman would admit to no such compromise:
Is not the miraculous infliction of judgments upon blasphemy, lying, profaneness, etc., in the apostles' day a sanction of infliction upon the same by a human hand in the times of the Inquisition? Ecclesiastical rulers may punish with the sword, if they can, and if it is expedient or necessary to do so. The church has a right to make laws and to enforce them with temporal punishments.
The question came forward in France in the wake of the temporal power. Liberal defenders of a government which made a principle of persecution had to decide whether they approved or condemned it. Where was their liberality in one case, or their catholicity in the other? It was the simple art of their adversaries to press this point, and to make the most of it; and a French priest took upon him to declare that intolerance, far from being a hidden shame, was a pride and a glory: "L'Eglise regarde l'Inquisition comme l'apogée de la civilisation chrétienne, comme le fruit naturel des époques de foi et de catholicisme national." Gratry took the other side so strongly that there would have been a tumult at the Sorbonne, if he had said from his chair what he wrote in his book; and certain passages were struck out of the printed text by the cautious archbishop's reviser. He was one of those French divines who had taken in fuel at Munich, and he welcomed Kirche und Kirchen: "Quant au livre du docteur Döllinger sur la Papauté, c'est, selon moi, le livre décisif. C'est un chef-d'œuvre admirable à plusieurs égards, et qui est destiné à produire un bien incalculable et à fixer l'opinion sur ce sujet; c'est ainsi que le juge aussi M. de Montalembert. Le docteur Döllinger nous a rendu à tous un grand service." This was not the first impression of Montalembert. He deplored the Odeon lectures as usurping functions divinely assigned not to professors, but to the episcopate, as a grief for friends and a joy for enemies. When the volume came he still objected to the policy, to the chapter on England, and to the cold treatment of Sixtus V. At last he admired without reserve. Nothing better had been written since Bossuet; the judgment on the Roman government, though severe, was just, and contained no more than the truth. There was not a word which he would not be able to sign. A change was going on in his position and his affections, as he came to regard toleration as the supreme affair. At Malines he solemnly declared that the Inquisitor was as horrible as the Terrorist, and made no distinction in favour of death inflicted for religion against death for political motives: "Les bûchers allumés par une main catholique me font autant d'horreur que les échafauds où les Protestants ont immolé tant de martyrs." Wiseman, having heard him once, was not present on the second day; but the Belgian cardinal assured him that he had spoken like a sound divine. He described Dupanloup's defence of the Syllabus as a masterpiece of eloquent subterfuge, and repudiated his interprétations équivoques. A journey to Spain in 1865 made him more vehement than ever; although, from that time, the political opposition inflamed him less. He did not find imperialism intolerable. His wrath was fixed on the things of which Spain had reminded him: "C'est là qu'il faut aller pour voir ce que le catholicisme exclusif a su faire d'une des plus grandes et des plus héroïques nations de la terre.—Je rapporte un surcroît d'horreur pour les doctrines fanatiques et absolutistes qui ont cours aujourd'hui chez les catholiques du monde entier." In 1866 it became difficult, by the aid of others, to overcome Falloux's resistance to the admission of an article in the Correspondant, and by the end of the year his friends were unanimous to exclude him. An essay on Spain, his last work—"dernier soupir de mon âme indignée et attristée"—was, by Dupanloup's advice, not allowed to appear. Repelled by those whom he now designated as spurious, servile, and prevaricating liberals, he turned to the powerful German with whom he thought himself in sympathy. He had applauded him for dealing with one thing at a time, in his book on Rome: "Vous avez bien fait de ne rien dire de l'absolutisme spirituel, quant à présent. Sat prata biberunt. Le reste viendra en son temps." He avowed that spiritual autocracy is worse than political; that evil passions which had triumphed in the State were triumphant in the Church; that to send human beings to the stake, with a crucifix before them, was the act of a monster or a maniac. He was dying; but whilst he turned his face to the wall, lamenting that he had lived too long, he wished for one more conference with the old friend with whom, thirty-five years before, in a less anxious time, he had discussed the theme of religion and liberty. This was in February 1867; and for several years he had endeavoured to teach Döllinger his clear-cut antagonism, and to kindle in him something of his gloomy and passionate fervour, on the one point on which all depended.
Döllinger arrived slowly at the contemplation of deeper issues than that of churchmen or laymen in political offices, of Roman or German pupils in theological chairs. After seeing Baron Arnim, in 1865, he lost the hope of saving the papal government, and ceased to care about the things he had contended for in 1861; and a time came when he thought it difficult to give up the temporal power, and yet revere the Holy See. He wrote to Montalembert that his illusions were failing: "Ich bin sehr ernüchtert.—Es ist so vieles in der Kirche anders gekommen, als ich es mir vor 20-30 Jahren gedacht, und rosenfarbig ausgemalt hatte." He learnt to speak of spiritual despotism almost in the words of his friend. The point of junction between the two orders of ideas is the use of fire for the enforcement of religion on which the French were laying all their stress: "In Frankreich bewegt sich der Gegensatz blos auf dem socialpolitischen Gebiete, nicht auf dem theologisch-wissenschaftlichen, weil es dort genau genommen eine theologische Wissenschaft nicht gibt" (16th October 1865). The Syllabus had not permanently fixed his attention upon it. Two years later, the matter was put more definitely, and he found himself, with little real preparation, turning from antiquarian curiosities, and brought face to face with the radical question of life and death. If ever his literary career was influenced by his French alliances, by association with men in the throng, for whom politics decided, and all the learning of the schools did not avail, the moment was when he resolved to write on the Inquisition.
The popular account which he drew up appeared in the newspapers in the summer of 1867; and although he did not mean to burn his ships, his position as an official defender of the Holy See was practically at an end. He wrote rapidly, at short notice, and not in the steady course of progressive acquisition. Ficker and Winkelmann have since given a different narrative of the step by which the Inquisition came into existence; and the praise of Gregory X., as a man sincerely religious who kept aloof, was a mark of haste. In the work which he was using, there was no act by that pontiff; but if he had had time to look deeper he would not have found him, in this respect, different from his contemporaries. There is no uncertainty as to the author's feeling towards the infliction of torture and death for religion, and the purpose of his treatise is to prevent the nailing of the Catholic colours to the stake. The spirit is that of the early lectures, in which he said: "Diese Schutzgewalt der Kirche ist rein geistlich. Sie kann also auch einen solchen öffentlichen hartnäckigen und sonst unheilbaren Gegner der Kirche nur seiner rein geistlichen kirchlichen Rechte berauben." Compared with the sweeping vehemence of the Frenchmen who preceded, the restrained moderation of language, the abstinence from the use of general terms, leaves us in doubt how far the condemnation extended, and whether he did more, in fact, than deplore a deviation from the doctrine of the first centuries. "Kurz darauf trat ein Umschwung ein, den man wohl einen Abfall von der alten Lehre nennen darf, und der sich ausnimmt, als ob die Kaiser die Lehrmeister der Bischöfe geworden seien." He never entirely separated himself in principle from the promoters, the agents, the apologists. He did not believe, with Hefele, that the spirit survives, that there are men, not content with eternal flames, who are ready to light up new Smithfields. Many of the defenders were his intimate friends. The most conspicuous was the only colleague who addressed him with the familiar German Du. Speaking of two or three men, of whom one, Martens, had specially attacked the false liberalism which sees no good in the Inquisition, he wrote: "Sie werden sich noch erinnern ... wie hoch ich solche Männer stelle." He differed from them widely, but he differed academically; and this was not the polish or precaution of a man who knows that to assail character is to degrade and to betray one's cause. The change in his own opinions was always before him. Although convinced that he had been wrong in many of the ideas and facts with which he started, he was also satisfied that he had been as sincere and true to his lights in 1835 as in 1865. There was no secret about the Inquisition, and its observances were published and republished in fifty books; but in his early days he had not read them, and there was not a German, from Basel to Königsberg, who could have faced a viva voce in the Directorium or the Arsenale, or who had ever read Percin or Paramo. If Lacordaire disconnected St. Dominic from the practice of persecution, Döllinger had done the same thing before him.
Weit entfernt, wie man ihm wohl vorgeworfen hat, sich dabei Gewalt und Verfolgung zu erlauben, oder gar der Stifter der Inquisition zu werden, wirkte er, nicht den Irrenden, sondern den Irrthum befehdend, nur durch ruhige Belehrung und Erörterung.
If Newman, a much more cautious disputant, thought it substantial truth to say that Rome never burnt heretics, there were things as false in his own early writings. If Möhler, in the religious wars, diverted attention from Catholic to Protestant atrocities, he took the example from his friend's book, which he was reviewing. There may be startling matter in Locatus and Pegna, but they were officials writing under the strictest censorship, and nobody can tell when they express their own private thoughts. There is a copy of Suarez on which a priest has written the marginal ejaculation: "Mon Dieu, ayez pitié de nous!" But Suarez had to send the manuscript of his most aggressive book to Rome for revision, and Döllinger used to insist, on the testimony of his secretary, in Walton's Lives, that he disavowed and detested the interpolations that came back.