But the post-Reformation dogmatists took fright at their own freedom. The prediction of the Romanists that repudiation of traditional authority in its ecclesiastical embodiment would result in internecine schism and conflict seemed on the point of being realized. The theological system-makers, like their predecessors of the post-apostolic age, could see no way out but to throw all their weight on a past inspiration assumed to be without error. The canonical books were declared to furnish an infallible rule of faith and practice.

It was in the sincere desire to meet the requirements of this theory that the science of criticism grew up. In the earlier days it did not venture for the most part beyond what is known as 'textual' criticism. For a doctrine of inerrancy is manifestly unserviceable until errors of transmission have been eliminated. Textual criticism set itself to this task, asking the question: As between the various readings found in different New Testament manuscripts, which is original? Unfortunately, to meet the logical requirement the critic, if not backed like those of Rome by a papal guarantee, must himself be infallible. The inevitable result of this attempt, begun in the sincerest spirit of apologetics, was to prove that an infallible text is hopelessly unattainable. Textual criticism is indispensable; but as the servant of apologetics it is foredoomed to failure.

The variation of the manuscripts was not the only obstacle to biblical infallibility. To say nothing of differences of interpretation there was the question of the canon. Either the decision of the 'catholic' church must be accepted as infallible, or scholarship must undertake a 'criticism of the canon' to defend the current list of "inspired" books. A 'higher' criticism became necessary if only to vindicate the church's choice on historical grounds. Roman Catholics like Simon, whose Critical History of the Biblical books appeared in 1689-1695, could reopen the question with impunity. Those who based their authority on the infallibility of Scripture alone could not meet the challenge otherwise than as Michælis did in his Introduction to the Divine Writings of the New Testament (1750-1780). Michælis undertook a historical inquiry into the circumstances of origin of each of the canonical books, with the object of proving each to be in reality what tradition declared. The twenty-seven commonly accepted were supposed to have been either written by apostles, or at least so super-intended and guaranteed by them, as to cover all with the ægis of an infallibility not conceded to the post-apostolic age. Scholarship in the harness of apologetics again found its task impracticable. Michælis himself confessed it "difficult" to prove authenticity in cases like that of the Epistle of Jude. Conceive the task as the scientific vindication of a verdict rendered centuries before on unknown grounds, but now deprived of official authority, and it becomes inevitably hopeless. Can it be expected that doctors will not disagree on the authenticity or pseudonymity of 2nd Peter, who always have disagreed on this and similar questions, and have just admitted failure to agree in the matter of text?

For half a century criticism seemed lost in the slough of mere controversy over the (assumed) infallible text, and the (assumed) infallible canon. Apologists fought merely on the defensive, endeavouring to prove that men whose fallibility was admitted had nevertheless pronounced an infallible verdict on the most difficult subjects of literary and historical inquiry. Critics had an easy task in showing that the church's theory of inspiration and canonicity was incorrect; but made no progress toward a constructive explanation of the religious, or even the historical, significance of the literature. Real progress was made only when criticism left off the attempt either to establish or disestablish a 'received' text, or an 'authorized' canon, and became simply an instrument in the hand of the historian, as he seeks to trace to their origins the ideas the church enshrined in her literature because she found them effective in her growth.

For the great awakening in which New Testament criticism 'found itself' as a genuine and indispensable branch of the history of religion, we are largely indebted to the eminent church historian, Ferdinand Christian Baur (ob. 1860). Baur gathered up the fragmentary results of a generation of mere negation, a war of independence against the tyranny of dogmatic tradition, and sought to place the New Testament writings in their true setting of primitive church history. His particular views have been superseded. Subsequent study has disproved many of his inferences, and brought from friend and foe far-reaching modifications to his general theory. But, consciously or not, Baur, in making criticism the hand-maid of history, was working in the interest of that constructive, Christian, doctrine of inspired Scripture which an ancient and nameless teacher of the church had described as "witness" to the Life, "even the eternal life, which was with the Father," and is in man, and has been manifested in the origin and historical development of our religion.

The Reformation had been a revolt against the despotism of the priest; this was a revolt against the despotism of the scribe.

Baur gave scant—too scant—consideration to early tradition, making his results unduly negative. None of the New Testament books are dated; few besides the Pauline Epistles embody even an author's name; and these few, 1st and 2nd Peter, James, Jude and Revelation, were (1st Peter alone excepted) just those which even the canon-makers had classified as doubtful, or spurious. Not even a Calvin would support the authenticity of 2nd Peter, a Luther had denied the value of James and Revelation. It had been an easy task for 'criticism of the canon' to show that those who determined its content had not been actuated by considerations of pure science. Those books secured admission which were most widely current as ancient and trustworthy, and whose orthodoxy met the standards of the time. Those were disputed, or rejected, which were less widely current, or unorthodox, or could establish no direct relation to an apostle. It was proper for the critic, once his aim had become not apologetic but historical, to drop once for all the question whether the canon-makers' selection—made not for scientific, but for religious purposes—is good, bad or indifferent. The time had come for him to apply the available evidence to his own scientific question: What relation do these several writings bear to the development of Christianity? It remained to be seen whether he could offer constructive evidence more convincing than tradition.

The latest date to which an undated, or disputed, writing can be assigned is that when the marks of its employment by others, or influence upon them, become undeniable. This is termed the 'external' evidence. The earliest date, conversely, is that to which we are brought down by references in the book itself to antecedent and current events, and writings, or by undeniable marks of their influence. This is termed the 'internal' evidence. Counting tradition as part of the external evidence, modern scientific criticism is able to fix within a few decades the origin of all the New Testament writings, without incurring opposition even from the apologist. No scholar now dreams of adopting any other method of proof, whatever his doctrinal proclivities. The overwhelming majority are agreed that the period covered, from the earliest Pauline Epistles to the latest brief fulminations against Gnostic Doketism and denial of 'resurrection and judgment,' is included in the century from a.d. 50 to 150.

Baur's conception of the course of events in this momentous century has been described as a theory of historical progress by fusion of opposites in a higher unity. The Hegelian scheme of thesis, antithesis and synthesis had in fact some justification in the recognized phenomena of the development of Christianity. It had sprung from Judaism, overcoming the particularism of that still nationalistic faith by the sense of its mission to the world at large. The conflict acknowledged in all the sources and most vividly reflected in the great Epistles of Paul to the Galatians, Corinthians and Romans, a conflict between those who conceived Christianity as a universal religion, and those who looked upon it as only a reformed, spiritualized and perfected Judaism, was the characteristic phenomenon of the first or apostolic age. It was the struggle of the infant faith against its swaddling bands. The critical historian is compelled to estimate all later, anonymous, accounts of this development in the light of the confessedly earlier, and indubitably authentic records, the four great Epistles of Paul; for these simply reflect the actual conditions, and are not affected by the later disposition to idealize the story. Thesis and antithesis were therefore really in evidence at the beginnings.

Equal unanimity prevailed as to the close of the period in question. In a.d. 150 to 200, Christianity was solidifying into the 'catholic' church, rejecting extremes of doctrine on both sides, formulating its 'rule of faith,' determining its canon, centralizing administrative control. It had thrown off as heretical upon the extreme left Marcion and the Gnostics, who either repudiated the Jewish scriptures altogether, or interpreted them with more than Pauline freedom. On the extreme right it had renounced the unprogressive Ebionites of Palestine, still unreconciled to Paul, and insistent on submission to the Law for Jew and Gentile, as the condition of a 'share in the world to come.' What could be imagined as to the course of events in the intervening century of obscurity? Must it not have witnessed a progressive divergence of the extremes of Paulinists and Judaizers, coincidently with a rapprochement of the moderates from the side of Peter and that of Paul respectively? Baur's outline seemed thus to describe adequately the main course of events. He relied upon internal evidence to determine the dates of the disputed writings and their relation to it. But 'criticism of the canon' in Baur's own, and in the preceding generation, had come to include among the writings of doubtful date and authenticity not only those disputed in antiquity, and the anonymous narrative books, but also 1st Peter and the minor Epistles of Paul. Nothing strictly apostolic was left save the four great Epistles of Paul.