One book in this group, Daniel, and portions of Ezekiel and Joel, are analogous to the New Testament Apocalypse, but otherwise the prophetic books correspond closely in character and contents to the epistles of the New. Both are direct messages to contemporaries of the prophets and apostles, and both deal with then existing conditions. Both consist of practical warnings, exhortations, advice, and encouragement. The form is simply incidental. The prophets of Jehovah preached, and then they or their disciples wrote down the words which they had addressed to their countrymen. When they could not reach with their voices all in whom they were interested, the prophets, like the apostles, committed their teachings to writing and sent them forth as tracts (_cf_. Jer. xxxvi.). At other times, when they could not go in person, they wrote letters. Thus, for example, the twenty-ninth chapter of the prophecy of Jeremiah opens with the interesting superscription: Now these are the words of the letter that Jeremiah the prophet sent from Jerusalem unto the residue of the elders of the captivity, and to the priests, and to the prophets, and to all the people, whom Nebuchadrezzar had carried away captive from Jerusalem to Babylon; by the hand of Elasah the son of Shaphan, and Gemariah the son of Hilkiah, whom Zedekiah king of Judah sent unto Babylon to Nebuchadrezzar. If it were not for this superscription, no one would suspect from the nature of the letter which follows that it was anything other than a regular spoken or written prophecy. Its contents and spirit are exactly parallel to those of Paul's epistles. Undoubtedly many prophecies were never delivered orally, but were originally written like Paul's Epistle to the Ephesians, and sent out as circular letters. The Babylonian exile scattered the Jews so widely that the exilic and post-exilic prophets depended almost entirely upon this method of reaching their countrymen and thus became writers of epistles. [Sidenote: _The oldest literature poetry_]