We have arrived in our study of the Sacred Scriptures at the threshold of the most interesting and the most momentous topic which is presented to the student of the Biblical literature,--the question of the origin of the Gospels. These Gospels contain the record of the life and the death of Jesus Christ, that marvelous Personality in whom the histories, the prophecies, the liturgies of the Old Testament are fulfilled, and from whom the growing light and freedom and happiness of eighteen Christian centuries are seen to flow. Most certain it is that the history of the most enlightened lands of earth during these Christian centuries could not be understood without constant reference to the power which came into the world when Jesus Christ was born. Some tremendous social force made its appearance just then by which the whole life of mankind has been affected ever since that day. The most powerful institutions, the most benign influences which are at work in the world to-day, can be followed back to that period as surely as any great river can be followed up to the springs from which it takes its rise. If we had not these four Gospels we should be compelled to seek for an explanation of the chief phenomena of modern history. "We trace," says Mr. Horton, "this astonishing influence back to that life, and if we knew nothing at all about it, but had to construct it out of the creative imagination, we should have to figure to ourselves facts, sayings, and impressions which would account for what has flowed from it. Thus, if the place where this biography comes were actually a blank, we should be able to surmise something of what ought to be there, just as astronomers surmised the existence of a new planet, and knew in what quarter of the heavens to look for it by observing and registering the influences which retarded or deflected the movements of the other planets." [Footnote: _Inspiration and the Bible,_ p. 65.] That place is not a blank; it is filled with the fourfold record of the Life from which all these mighty influences have flowed. Must not this record prove to be the most inspiring theme open to human investigation? Is it any wonder that more study has been expended upon this theme than upon any other which has ever claimed the attention of men? What do we know of the origin of this four-fold record? Origin it must have had like every other book, an origin in time and space. That there are divine elements in it the most of us believe; but the form in which we have it is a purely human form, and it would be worthless to us if it were not in purely human form. The sentences of which it is composed were constructed by human minds, and were written down by human hands on parchment or papyrus leaves. When, and where, and by whom? These are the questions now before us. Let us go back to the last half of the second century and see what traces of these books we can find.