This mishnah brings to a close the material unrelated to the general topic of the tractate, which has been prompted by an associational format: midrashic explications given by Rabbi Akiva "on that very day" - on the day that Rabban Gamli'el was deposed from the presidency of the Sanhedrin and replaced by Rabbi El'azar ben-Azaryah. However, in this last mishnah of chapter 5 it is Rabbi Yehoshu'a who offers the exegesis and not Rabbi Akiva.
2:
The book of Job is one of the greatest literary gems of the third section of the bible, the hagiographa. Despite the fact that the Gemara [Bava Batra 14b] suggests that the book of Job was written by none other than Moses himself, the absolute consensus of modern scholarship is that its language, its content and its style all point to it as being a product of the period of the second Bet Mikdash, probably during the 3rd or 2nd century BCE. (The very fact that the book is included in the hagiographa and not in the Torah or the prophets is conclusive evidence of its lateness.) The book consists of an outer literary framework (chapters 1,2 and 42) and the main kernel of the work (chapters 3 to 41). The outer framework presents a picture of the perfect man who is subjected by God to heartbreaking tragedies simply in order to prove that he really is God-fearing and that he is not a time-server, as Satan claims. This outer story is either borrowed by the author from an already existent literature about the Canaanite hero, Job, or it was specially written by the author in order to contrast starkly with the main burden of his message. (Concerning the Canaanite origins of Job see what I wrote about Parashat Noaĥ: the comment is available at our website )
3:
In the outer story Job is portrayed as an impossibly pious man who absolutely refuses to doubt God's essential righteousness even when he believes that God is almost thrashing the very life out of him. The portrayal borders on the comic. The main part of the book shows Job as full of doubts: he desperately wants to understand why there is suffering in God's world. The format is that of a Greek tragedy (such as those of Sophocles, Euripedes etc) in which various friends come to comfort Job in his great tragedy and he enters into argument with them. The friends offer various theological propositions which serve to 'explain' suffering in general and Job's suffering in particular. Job refutes these specious arguments one by one. Ultimately Job summons God to appear in court to justify Himself. God answers the summons (chapters 38-41) and the general thrust of his argument is that mortal man is not capable of understanding divine purposes. (I have often described the whole of the book thus: for dozens of chapters Job asks 'why?', and at the end God answers 'because!'.)
4:
The dialogue format of the book is typical of the Greek tragedy as I have already pointed out. But among the sages there was not unanimity as to how to relate to the book. In the Gemara [Bava Batra 15a] we find an anonymous sage who claims that "Job never existed, he is just an allegory" - a claim which shocked other sages. I do not think that we should have any qualms about seeing the book of Job as one of the greatest dramatic philosophies ever composed - by an unknown author.
To be continued.