It is a universal Christian belief that God reveals himself to-day in divers manners and modes. Every Christian believes, for example, that God reveals himself in the events of history, be it the history of individuals or of nations. Again, to many devout persons, God speaks very distinctly through the outward acts and ceremonies of worship. To thousands of earnest and sincere Christians connected with churches using an elaborate ritual, this ritual is no mere form; it is a means of blessing and grace through which God reveals himself to their souls. Moreover, God selects certain persons, especially well qualified to hear his voice; these he commissions as ambassadors to declare him and his will to the people. The belief in this method of revelation is the philosophical basis for the offices of the Christian preacher and the Christian religious teacher. Once more, in his attempt to reach the human heart God may dispense with all external means; he may and does reveal himself by working directly upon and in the mind and spirit of the individual. These are some of the "manners" in which God reveals himself to his children to-day, and these are some of the means and manners in which God made himself known during the Old Testament dispensation. Then, as he does now, he revealed himself in nature, in the events of history, in the ritual, and by direct impressions; and at times he selected certain individuals to whom he might make himself known in all these various ways and who could transmit the various revelations to others. The Old Testament contains records and interpretations of these manifold revelations. It is self-evident that when attempts were made to record these various manifestations of God different kinds of literature must be used in order to express most vividly the truth or truths gathered from the divine revelations. The several kinds of literature, therefore, are the natural outgrowth of the manifold modes of divine revelation. In the Old Testament five kinds of literature may be distinguished: the prophetic, the wisdom, the devotional, the legal or priestly, and the historical. In their production four classes of religious workers who observed, interpreted, and mediated the divine revelations, were active: the prophets, the wise men, the priests (compare Jer. 18. 18), and the psalmists.
The prophetic literature owes its origin to prophetic activity. The prophets towered above their contemporaries in purity of character, strength of intellect, sincerity of purpose, intimacy of communion with God, and illumination by the divine Spirit. As a result of these qualifications they were able to understand truth hidden from the eyes and minds of those who did not live in the same intimate fellowship with Jehovah. Their high conceptions of the character of God enabled them to appreciate the divine ideals of righteousness, and they sought with flaming enthusiasm to impress the truths burning in their hearts upon their less enlightened contemporaries. In carrying out this purpose they became statesmen, social reformers, and religious and ethical teachers. No records have been preserved of the utterances of the earliest prophets. But when, with the general advance in culture, reading and writing became more common, the prophets, anxious to reach a wider circle, and to preserve their messages for more willing ears, put their utterances into writing, and to this new departure we owe the sublime specimens of prophetic literature in the Old Testament.
In his direct appeal to heart and conscience the ancient prophet resembles the modern preacher. The wise man, like the prophet, sought to make the divine will known to others, but in his method he resembles, rather, the modern religious teacher. His ultimate aim was to influence conduct and life, but instead of appealing directly to the conscience he addressed himself primarily to the mind through counsel and argument, hoping that his appeal to the common sense of the listener would make an impression, the effects of which might be seen in transformed conduct. The prophet would have said to the lazy man, "Thus saith Jehovah, Go to work, thou indolent man." Prov. 24. 30-34 may serve as an illustration of the method of the wise man:
I went by the field of the sluggard,
And by the vineyard of the man void of understanding;
And, lo, it was all grown over with thorns,
The face thereof was covered with nettles,
And the stone wall thereof was broken down
Then I beheld, and considered well;
I saw, and received instruction:
Yet a little sleep, a little slumber,
A little folding of the hands to sleep;
So shall thy poverty come as a robber,
And thy want as an armed man.
Nothing escaped the observation of these men, and from beginning to end they emphasized the important truth that religion and the daily life are inseparable. From giving simple practical precepts, the wise men rose to speculation, and the books of Job and Ecclesiastes bear witness that they busied themselves with no mean problems.
Of profound significance is also the devotional literature of the Old Testament. In a real sense the entire Old Testament is a book of devotion. It is the outgrowth of a spirit of intense devotion to Jehovah, and it has helped in all ages to nurture the devotional spirit of its readers. Here, however, the term "devotional" is used in the narrower sense of those poetic compositions which are primarily the expressions of the religious experience or emotions of the authors, generated and fostered by their intimate fellowship with Jehovah. The chief representative of this literature is the book of Psalms, which is aptly described by Johannes Arnd in these words: "What the heart is in man, that is the Psalter in the Bible." The Psalms contain in the form of sacred lyrics the outpourings of devout souls—prophets, priests, kings, wise men, and peasants—who came into the very presence of God, held communion with him, and were privileged to hear the sweet sound of his voice. No other literary compositions lift us into such atmosphere of religious thought and emotion. Because these lyrics reflect personal experiences they may still be used to express emotions of joy, sorrow, hope, fear, anticipation, etc., even by persons who live on a higher spiritual plane than did the original authors.
The legal literature differs from the other kinds in that it does not form separate books, but is embodied in other writings, principally in the books of Exodus, Leviticus, Numbers, and Deuteronomy. All the representatives of Jehovah—prophets, priests, wise men, and even psalmists—were thought competent to make known the law of Jehovah, but the Old Testament makes it clear that at a comparatively early period the giving of law came to be looked upon as the special duty of the priests. These priests constituted a very important class of religious workers among the ancient Hebrews. During the greater part of the national life their chief functions were the care of the sanctuary and the performance of ceremonial rites. But in addition to these duties they continued to administer the law of Jehovah, consisting not only of ceremonial regulations but also of moral and judicial precepts and directions. For centuries these laws may have been transmitted by word of mouth, or were only partially committed to writing, but when circumstances made it desirable to codify them and put them in writing the priests would be called upon to take this advance step. Thus, while it is quite probable that other representatives of Jehovah helped to formulate laws, the legal literature embodied in the Old Testament reached its final form under priestly influence.
The historical literature furnishes an interpretation of the movements of God in the events of history. It owes its origin in part to prophetic, in part to priestly, activity. The prophet was an ambassador of Jehovah appointed to make known the divine will concerning the past, the present, and the future. Of the present he spoke as a preacher; when his message concerned the future it took the form of prediction; but the case might arise that the people failed to understand the significance of events in their own history, and thus failed to appreciate the lessons which the events were intended to teach. If these lessons were not to be lost, some one must serve as an interpreter, and who would be better qualified to furnish the right interpretation than the prophet? This demand made of him, in a sense, an historian, not for the purpose of merely recording events but of interpreting them at the same time, and these prophetic interpretations are embodied in the historical literature originating with the prophets.
But not all Old Testament history comes from the prophets. As already indicated, the legal and ceremonial literature is due to priestly activity. Now, in connection with the recording of the laws, customs, institutions, and ceremonial requirements, the origin of these laws and customs became a matter of interest and importance. This interest, and the demand for information arising from it, led the priests also to become historians. And to these priestly writers we are indebted for not a small part of sacred history.
The third truth taught by the writer of the Epistle to the Hebrews is that God spoke unto the fathers in or by the prophets, which means, that he used human agents to mediate his revelations. The Old Testament may be more than a human production; nevertheless, it will be impossible to appreciate it adequately unless it is borne in mind that it contains a human element. In the first place may be noted the differences in style between various writers. These are frequently the outgrowth of differences in temperament and early training. Even the English reader can notice such differences between Amos and Hosea, or between Isaiah and Jeremiah. Evidently, whatever divine coöperation the biblical writers enjoyed, they retained enough of their human faculties and powers to make use of their own peculiar styles.