Ellicott's Commentary On The Whole Bible
Job 9 - Introduction
IX.
Then Job answered... — Job’s reply to Bildad differs from that to Eliphaz, inasmuch as he exposes the hollowness of Bildad’s position by sapping his foundation. Admitting the general propriety of all he has said, he confronts him with the anterior question, “How can weak man be just with God?” and this is the question, if fairly dealt with, which must always confound shallow generalisers like Bildad.