The prophets: Who were these guys?

An introductory episode to the ancient prophets in the Bible.In the words of AW Tozer: "If Christianity is to receive a rejuvenation... another kind of religious leader must arise among us. He must be of the old prophet type, a man who has seen visions of God and has heard a voice from the Throne... Such a man is likely to be lean, rugged, blunt-spoken and a little bit angry with the world. He will love Christ and the souls of men to the point of willingness to die for the glory of the One and the salvation of the other. But he will fear nothing that breathes with mortal breath."