Job replies, "I know you can do everything, that nothing is impossible for you. Hear me now."
What Job wishes for the Lord to hear is "I thought I knew you, but I lacked knowledge. Now that I see you clearly, I recant and repent."
Allen & Williamson in Preaching the Old Testament remind us that Job 42:6 is difficult to interpret:
Some scholars think that Job recognizes that both the Deuteronomic viewpoint on blessing and curse (represented in the book of Job by the friends) and Job's persistent demands to understand this notion in another framework of meaning comes up short. Having been addressed directly by the awesome God, Job recognizes that chaos is innately a part of creation and neither chaos nor prosperity can be neatly explained. While chaos is powerful, God's speeches in chapters 38 through 41 assure Job that it will not destroy the patterns of life through which God supports the world.