Gregory the Dialogist

Wherefore is light given to one that is in misery? In holy Scripture prosperity is sometimes represented by the title of light, and this world's adversity by the name of night. Hence it is well said by the Psalmist, As is its darkness, so also is its light. …

Morals on the Book of Job, Book V ↗

Thomas Aquinas

After Job has detested his own life in many ways, he now detests the life of the whole human race taken collectively, both of those in prosperity and those in adversity. He begins to treat first of those who are more renowned. Note that there are two things which belong especially to living beings: to live and to know. Although knowing in itself is very delightful and very noble, yet to know those things which cause affliction is painful. …

Commentary on Job ↗