Their heart is as gross as grease; but I delight in your law.
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Augustine of Hippo
AD 430
69. "Their heart is curdled as milk" (ver. 70). Whose, save the proud, whose iniquity he hath said hath been multiplied upon him? But he wisheth it to be understood by this word, and in this passage, that their heart hath become hard. It is used also in a good sense, and is understood to mean, full of grace: for this word, some have also interpreted "curdled." ...
Curdled. Grown hard, like milk that is curdled and turned to cheese. (Challoner)
Hebrew, "like fat. "They have no compassion or wisdom, Isaias vi. 10. (Calmet)
Without the points, cheleb means also milk. (Berthier)
The wicked combine together for my ruin: but I will still be faithful. (Worthington)