Gregory the Dialogist

I was afraid of all my works, knowing that Thou wouldest not spare me, when guilty of transgression. What were the works that blessed Job practised, the text of this sacred history makes plain. For he studied to propitiate his Maker by numberless burnt offerings; in that according to the number of his sons, as it is written, rising up early in the morning, he offered burnt offerings for each, and purified them not only from impure actions, but likewise from bad thoughts. …

Morals on the Book of Job, Book IX ↗

Thomas Aquinas

He then expresses the cause of his pain saying, "I was anxious about everything I did." For the cause of pain is great for someone when he has great anxiety about some one thing and yet he falls in the very thing he tries to avoid. However, he experiences great anxiety about everything he does fearing lest he will fall away from justice in some way. This is what he means when he says, "anxious about everything I did." The reason why he was so anxious about everything he did was fear of the severity of the divine judgment. …

Commentary on Job ↗

Bonaventure

Anyone who wishes to obtain advantages from his studies should be holy and should work for a life that is reverent, pure, religious, and edifying. Now the reverent life of the saints consists in this, that in anything they do, they be always in a state of fear, whether going to Mass or to table, whether walking or standing still, for in anything there is a possibility of sin. "Then I am in dread of all my pains; I know that you will not hold me innocent." The best sign is fear, and the worst, temerity, for such is never corrected.

Collations on the Hexaemeron, Collation 19 ↗