What is the theme of his response?
Malbim: Divinity is perfection, without shortcomings. Crooked judgment is a shortcoming! Iyov agreed, but he held that man is subject to chance occurrences. A Tzadik is stricken - this is not due to Hashem, rather, to the Ma'arachah, which does not distinguish between Tzadik and Rasha. Bildad held that Hashem would not hand over conduct to a 'blind' Ma'arachah. Why is a Tzadik afflicted? It is to benefit him afterwards - even if he did nothing wrong. This is like a plant planted in a dry, rocky place - the owner uproots it and replants it in a good place. The uprooting was to help it! Iyov should strengthen himself, trust in Hashem and supplicate to him. Not all plants can be replanted. A Rasha used to indulging cannot be uprooted from his place - rather, Hashem takes him from the world before his time.
Why did he say "Ad An Temalel Eleh"?
Devar Eliyahu: His matters are repeated in different words. "Va'Ya'an... va'Yomar; ...Temalel Eleh, v'Ru'ach Kabir Imrei Ficha." The two expressions correspond, respectively, to the two aspects of speech - external speech on the lips, and inner speech of understanding. Temalel Eleh is like showing with the finger. V'Ru'ach Kabir Imrei Ficha refers to great intent, like "ha'Ru'ach Asher Alecha."
Malbim: You say that Hashem handed over conduct to the Ma'arachah, which does not distinguish between Tzadik and Rasha. I answer you...
What is "Ru'ach Kabir"?
Rashi: A spirit of words. Kabir is an expression of much. Ibn Ezra - this is like "Kabir Yoshevim" - there, the Aleph is extra.
