Malbim: Elifaz reiterated his claim that man cannot justify himself in front of Hashem. He did not say anything new to support his opinion that man has choice. Iyov replies, why do you repeat what you already said?

Malbim: You are like people who cannot console with words that the heart accepts. They elaborate until the mourner wearies from answering, and he needs to be quiet, and the 'consolers' think that they consoled him.