John Gill Commentary Psalms 119:70

"Their heart is as fat as grease; But I delight in thy law." — Psalms 119:70 (ASV)

Their heart is as fat as grease
Or tallow, a lump of it, fat or grease congealed. That is, the heart of the above proud persons, who abounded in riches, were glutted with the things of this world; had more than heart could wish, and so became proud and haughty: or their hearts were gross, sottish, senseless, and stupid, as persons fat at heart are; or as creatures over fat, which has little or no feeling: so these had no knowledge of the law of God, no sense of their duty, no remorse of conscience for sin; their hearts were hardened, and they past feeling, and given up to a reprobate mind; see (Isaiah 6:9Isaiah 6:10) ; The Targum is, ``the imagination of their heart is become gross as fat:'' the Septuagint is, "curdled like milk"; that is, hardened, as Suidas^F19.

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[but] I delight in your law ;
after the inward man; as the apostle did, (Romans 7:22) ; as fulfilled in Christ; as in his hands, as King and Lawgiver; as written upon his own heart; and so yielding a ready and cheerful obedience to it; he delighted in reading the law, in meditating on it, and in observing it.

FOOTNOTES:

• F19: In voce (eturwyh). interprets it;