George Haydock's Catholic Commentary
Psalms 103:26
Go. The sea, which seems to be placed as a barrier, tends, by means of navigation, to the general convenience of nations. (Calmet) --- Dragon. Leviathan, a huge fish, (Job xl. 20.; Worthington) which Bochart takes to be the crocodile; though that monster is found rather in rivers. (Berthier) --- It designates here all whales, and other great fishes which play in the sea without experiencing any fear like mortals. Some translate "to play with it," (Calmet) as Greek: auto cannot agree with Greek: Thalassa. (Berthier) --- The prodigious size of these fishes costs God nothing. (Calmet) --- The whole creation is but a plaything for him, ludens in orbe terrarum, Proverbs viii. 31. (Haydock) --- Some Jews impiously pretend that God plays three hours a day with the leviathan, and that he only created two; one of which he killed to make a feast for the elect, and the other causes the tides, by turning itself, &c. See 4 Esdras, written at least in the second century. (St. Jerome) (Muis) (Calmet) --- Though this monster be too strong for man, it cannot defend itself out of water; (Worthington) and even in its own element man gains the victory by his skill. (Haydock)