Jerome

'Behold, he hath been in labour with injustice: he hath conceived sorrow, and brought forth iniquity.' Such a mother, such a father is the devil: thus he conceives, thus he is in labour, thus he nurses, thus he exalts.

Homily 3, on Psalm 7 ↗

Thomas Aquinas

Then when he says, "Behold," he treats of the preparation on the part of the man to be punished. Here he proposes two things: the progress into sin, by which one is prepared for punishment; and second, the incurring of the punishment: "a pit," etc. In the progress of sin, three things occur: the evil purpose, the endeavor, and the effect. And thus the enemies of David first conceived their plan, but at that time were in the stage of endeavor, and afterward carried it out. …

Exposition on the Psalms of David ↗