Gregory the Dialogist

So am I made to possess months of vanity, and I have numbered me wearisome nights. Yet, if this sentence be referred to the voice of Holy Church, the meaning thereof is traced out with a little more particularity. For she herself has 'months of vanity,' who in her weak members has to bear earthly actions running on to nought without the meed of life. She 'numbers to herself wearisome nights,' in that in her strong members she bears manifold afflictions. …

Morals on the Book of Job, Book VIII ↗

Thomas Aquinas

"So I have passed empty months," for I considered the past months passed empty for me, because I did not obtain final perfection in them. "And nights," i.e. when I should have been resting from my afflictions. "I have counted sleepless," i.e. I considered them sleepless because I was delayed in them from the attainment of my end.

Commentary on Job ↗

Bonaventure

Likewise, Gregory, in the Moralia, on that passage of Job: I have numbered for myself laborious nights: "The elect serve the Creator of all things and are often straitened by want of things; they cling to God through love, and yet they lack the supports of the present life." To lack the supports of the present life, therefore, is fitting to the perfection of the Saints.

Disputed Questions on Evangelical Perfection, Question 2 ↗