The Final Mishnah - The Exposition of Yehoshua ben Perachyah:
On that same day Yehoshua ben Perachyah taught that Iyov served Hashem only out of love, as it says in the book of Iyov: "Hein yikteleni, lo ayacheil" - even if He takes my life, I will still hope in Him. In other words: regardless of what He does with me, I act out of love.
The Doubt in the Meaning of the Word "Lo":
Still, a question mark remains here, says the Mishnah: the word "lo" is sometimes expounded as though written with a vav and sometimes as though written with an aleph - "to Him" or "not" - independent of the way it is actually spelled. Does the verse mean "I will no longer hope in Him," or perhaps "I will still hope in Him"?
Another verse in the book of Iyov shows and teaches us: until I die I will not remove from myself my wholehearted faith in the Holy One - that is, I will hold on to it even to the point of death. From here we see that Iyov served the Holy One out of love.
The Words of Rabbi Yehoshua ben Chananya:
The one who says this is not Yehoshua ben Perachyah, but Rabbi Yehoshua - Rabbi Yehoshua ben Chananya: "Who will remove the dust from your eyes," if only you were still alive. All your days you taught that Iyov served Hashem only out of fear, as it says of him at the beginning of the book: "Ish tam v'yashar, yerei Elokim v'sar meira" - this teaches that he feared Hashem, not that he loved Hashem. Yet Yehoshua, that is Yehoshua ben Perachyah, who was the student of your student, taught from the verse in Iyov that Iyov truly acted out of love of Hashem.
In summary: In the final Mishnah we learned the exposition of Yehoshua ben Perachyah, that Iyov served Hashem out of love, from the verse "Hein yikteleni, lo ayacheil"; we examined the doubt in the meaning of the word "lo" - "to Him" or "not" - and its resolution from another verse in Iyov, that he held on to his wholehearted faith even to the point of death. Against this was brought the approach of that sage who all his days taught that Iyov served out of fear alone, since it says of him "yerei Elokim v'sar meira," and it was the student of his student who taught that he acted out of love.