Then Job answered the LORD and said:
The words of Job justifying himself were ended, Job 31:40. After that he said no more to that purport. The words of Job judging and condemning himself began, Job 40:4, Job 40:5. Here he goes on with words to the same purport. Though his patience had not its perfect work, his repentance for his impatience had.
Commenting on Job 42:1-6
Then Job answered the Lord, and said. For though he had said he would answer no more, Job 40:5; yet he might mean not in the manner he had, complaining of God and justifying himself; besides he might change his mind without any imputation of falsehood or a lie; see Jer 20:9; to which may be added, that he had then said all he had...
He beholdeth all high [things]: he [is] a king over all the children of pride. (m) He despises all other beasts and monsters, and is the proudest of all others.