Gregory the Dialogist

For the plainly spoken words of these interpreting have made the sentences of the ancient Fathers henceforth clear to us. Hence the Prophet Isaiah viewing the words plain by the interpretation of Holy Church, not obscured by the darkness of allegories, exclaimed, saying, "The place of rivers, the broadest and open streams." For the sayings of the Old Testament were as narrow and close streams, which bound up the sentences of their lore in the darkest gathering together. …

Morals on the Book of Job, Book 18 ↗

Thomas Aquinas

Abundance of waters: a place of rivers, that is, of divine admonitions; streams, diverse modes of participation: the stream of the river makes the city of God joyful (Ps 45:5). Nonetheless, the Jews fabulously refer all this to the golden age of Jerusalem. 730. Second, as to its freedom from evils: no ship with oars, belonging to any of their enemies, who were accustomed to harass the promised land by way of the sea, has passed by it, using the past tense for the future; the great galley (trieris), a ship having three rows of oars.

Commentary on Isaiah ↗