Gregory the Dialogist

Shall mortal man be more just than God? Shall a man be more pure than his Maker? Human righteousness compared with the righteousness of God is unrighteousness, for even a candle is seen to shine bright in the dark, but being set in the ray of the sun its light is darkened. What then did Eliphaz learn when he was transported in contemplation, saving that man cannot be justified in comparison with God? …

Morals on the Book of Job, Book V ↗

Thomas Aquinas

Finally, he expresses the words which he asserts were revealed to him when he says, "Can mortal man be righteous before God?" He introduces these words to confirm his opinion which he already touched on (v. 7), namely, that adversities do not happen to someone in this life except because of sin. He introduces three reasons to prove that no one can excuse himself when he suffers adverse things asserting that he is free from sin. The first of these is taken from a comparison of man to God and leads to an impossible conclusion. …

Commentary on Job ↗