Gregory the Dialogist

Even, as I have seen, they that plough iniquity, and sow sorrows, and reap the same, by the blast of God do they perish, and by the breath of His nostrils are they consumed. To 'sow griefs' is to utter deceits, but to 'reap griefs' is to prevail by so speaking. Or, surely, they 'sow griefs,' who do froward actions, they 'reap griefs,' when they ate punished for this forwardness. …

Morals on the Book of Job, Book V ↗

Thomas Aquinas

Given therefore that adversity does not happen to the innocent and the upright, he consequently identifies those who experience adversity, "No, rather, I have seen that those who do evil and sow pains, reap the same." When he says, "I have seen," he makes allusion to the fact that he himself has proven these things by experience. For those "who do evil," he understands those who openly do injustice especially by harming others. For those who "sow pains and reap the same," he understands those who harm others by deceit. …

Commentary on Job ↗