Albert Barnes 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 — They are prospered. They have health, property, influence, comforts of all kinds. Heaven appears to smile upon them, and it seems as if it were one effect of a wicked course of life to make people prosperous. See Psalm 17:10, note; Psalms 73:7, note.

But I delight in thy law — Though its observance should not be attended by any such results as seem to follow wickedness, though I am poor, emaciated, pale — disappointed, slandered, persecuted — though my lot in life is among the lowly and the despised — yet I will adhere to my purpose to keep your law. It is, and it shall be, my delight, whatever may be the effects of so observing it. See Psalm 119:35.