One argument made from a “conservative” position against the inerrancy of Scripture is that we must admit error in the Scripture if we take the human authorship seriously. Unless we we want to subscribe to a dictation theory of inspiration (the human authors merely copied what God or an angel said to them), human error is a necessary correlate of Scripture as we have it.

Warfield responded to that argument as follows. First, he explicitly rejected a diction model of inspiration:

[T]he gift of Scripture through its human authors took place by a process much more intimate than can be expressed by “dictation,” and that tit took place in a process in which the control of the Holy Spirit was too complete and pervasive to permit the human qualities of the secondary authors in any way to condition the purity of the product as the word of God. The Scriptures, in other words, are conceived by the writes of the New Testament as through and through God’s book, in every part expressive of His mind, given through men after a fashion which does no violence to their nature as men, and constitutes the book also men’s book as well as God’s, in every part expressive of the mind of its human authors.

From his essay “Inspiration” (page 99 of volume 1 of the collected works). Warfield then explains how the work of God began well before the actual task of writing by creating and preparing the men who would be the authors to be the authors. This move by Warfield is brilliant, because it draws the fully natural act of normal men into relationship with the supernatural act of the Holy Spirit in inspiration:

And there is the preparation of the men to write these books to be considered, a preparation physical, intellectual, spiritual, which must have attended them throughout their whole lives, and, indeed, must have had its beginning in their remote ancestors, and the effect of which was to bring the right men to the right places at the right times, with the right endowments, impulses, acquirements, to write just the books which were designed for them. When “inspiration,” technically so called, is superinduced on lines of preparation like these, it takes on quite a different aspect from that which it bears when it is thought of as an isolated action of the Divine Spirit operating out of all relation to historical processes. Representations are sometimes made as if, when God wished to produce sacred books which would incorporate His will—a series of letters like those of Paul, for example—He was reduced to the necessity of going down to earth and painfully scrutinizing the men He found there, seeking anxiously for the one who, on the whole, promised best for His purpose; and then violently forcing the material He wished expressed through him, against his natural bent, and with as little loss from his recalcitrant characteristics as possible. Of course, nothing of the sort took place. If God wished to give His people a series of letters like Paul’s, He prepared a Paul to write them, and the Paul He brought to the task was a Paul who spontaneously would write just such letters.

If we bear this in mind, we shall know what estimate to place upon the common representation to the effect that the human characteristics of the writers must, and in point of fact do, condition and qualify the writings produced by them, the implication being that, therefore, we cannot get from man a pure word of God. As light that passes through the colored glass of a cathedral window, we are told, is light from heaven, but is stained by the tints of the glass through which it passes; so any word of God which is passed through the mind and soul of a man must come out discolored by the personality through which it is given, and just to that degree ceases to be the pure word of God. But what if this personality has itself been formed by God into precisely the personality it is, for the express purpose of communicating to the word given through it just the coloring which it gives it? What if the colors of the stained-glass window have been designed by the architect for the express purpose of giving to the light that floods the cathedral precisely the tone and quality it receives from them? What if the word of God that comes to His people is framed by God into the word of God it is, precisely by means of the qualities of the men formed by Him for the purpose, through which it is given? When we think of God the Lord giving by His Spirit a body of authoritative Scriptures to His people, we must remember that He is the God of providence and of grace as well as of revelation and inspiration, and that He holds all the lines of preparation as fully under His direction as He does the specific operation which we call technically, in the narrow sense, by the name of “inspiration.” The production of the Scriptures is, in point of fact, a long process, in the course of which numerous and very varied Divine activities are involved, providential, gracious, miraculous, all of which must be taken into account in any attempt to explain the relation of God to the production of Scripture. When they are all taken into account we can no longer wonder that the resultant Scriptures are constantly spoken of as the pure word of God. We wonder, rather, that an additional operation of God—what we call specifically “inspiration,” in its technical sense—was thought necessary. Consider, for example, how a piece of sacred history—say the Book of Chronicles, or the great historical work, Gospel and Acts, of Luke—is brought to the writing. There is first of all the preparation of the history to be written: God the Lord leads the sequence of occurrences through the development He has designed for them that they may convey their lessons to His people: a “teleological” or “aetiological” character is inherent in the very course of events. Then He prepares a man, by birth, training, experience, gifts of grace, and, if need be, of revelation, capable of appreciating this historical development and eager to search it out, thrilling in all his being with its lessons and bent upon making them clear and effective to others. When, then, by His providence, God sets this man to work on the writing of this history, will there not be spontaneously written by him the history which it was Divinely intended should be written? Or consider how a psalmist would be prepared to put into moving verse a piece of normative religious experience: how he would be born with just the right quality of religious sensibility, of parents through whom he should receive just the right hereditary bent, and from whom he should get precisely the right religious example and training, in circumstances of life in which his religious tendencies should be developed precisely on right lines; how he would be brought through just the right experiences to quicken in him the precise emotions he would be called upon to express, and finally would be placed in precisely the exigencies which would call out their expression. Or consider the providential preparation of a writer of a didactic epistle—by means of which he should be given the intellectual breadth and acuteness, and be trained in habitudes of reasoning, and placed in the situations which would call out precisely the argumentative presentation of Christian truth which was required of him. When we give due place in our thoughts to the universality of the providential government of God, to the minuteness and completeness of its sway, and to its invariable efficacy, we may be inclined to ask what is needed beyond this mere providential government to secure the production of sacred books which should be in every detail absolutely accordant with the Divine will.

Benjamin B. Warfield, The Works of Benjamin B. Warfield: Revelation and Inspiration, vol. 1, 101–103.