Perhaps after finishing Gregory’s Moralia I shall read St. Thomas’s Commentary on Job. Jeremy Holmes has a splendid introduction to the new English translation at the Aquinas Institute for Sacred Doctrine. He makes an interesting point about the constraints that a commentary makes on its author, as opposed to a speculative work such as the Summa Contra Gentiles:
Everyone knows that the artist flourishes under constraint: the poet’s creativity is unlocked, not diminished, by a rigid sonnet structure; the architect’s brilliance emerges especially under the demands of an unusual terrain; the painter’s genius rises to the challenge of a fresco where ceiling and walls dictate the contours. The same is true of a theologian. It is one thing to compose a treatise on divine providence in the open spaces of unshackled speculative reason; it is quite another thing to teach about divine providence through respectful engagement with the complicated, pungent, and often obscure poetry of Job.
In St. Gregory’s case, “constraint” is perhaps not the right word, as he uses Job as an occasion to talk about everything. As Gregory explains, he sees what we might call “going off on tangents” as a duty of the commentator:
He who explains the word of God should imitate the behavior of a river. when a river flows in its bed and the side of the bed dips down, the river promptly turns its course to include the dip. When it has filled the lower level, the river returns to its normal course. the one who explains God’s word should act in like manner; whoever is explaining something and notices a chance occasion of edification close at hand should direct the waters of eloquence there, as though it were a dip at the side, and then when the lower ground has been inundated by instruction, he may return to his former discourse. (Moralia, Letter to Leander, 2)