The books of 'latter prophets' preserve sayings and stories of religious and political activists ('prophets') who served as the spiritual conscience of the nation throughout its history, reminding people of the social values that would reflect the character of God. Some books are substantial (Isaiah, Jeremiah, Ezekiel), others are much shorter (Hosea, Joel, Amos, Obadiah, Jonah, Micah, Nahum, Habakkuk, Zephaniah, Haggai, Zechariah, Malachi). Sometimes, the prophets could be mime artists and dramatists, accompanying their actions by short spoken messages, often delivered in poetic form. These were the sound bites of their day, which made it easy for others to remember them and then write them down. (BBC)