Their heart is as fat as grease; [but] I delight in thy law.
Ver. 70. Their heart is as fat as grease] Gross as grease; curdled as milk or cheese, say the Septuagint, congealed and baked as it were in their sins. Obtusum et quasi adipe obductum; fat things are less sensible, and fat-hearted people are noted by Aristotle for dull and stupid.
But I delight in thy law] Illa me pasco et sagino, therewith I feed and fat myself.