Charles Ellicott Commentary Psalms 119:71

"It is good for me that I have been afflicted; That I may learn thy statutes." — Psalms 119:71 (ASV)

It is good ... —See Psalm 119:67. Probably the result of discipline on the nation is intended, though the “sweet uses of adversity” were long ago a truism of moralists. See Aeschylus, Agamemnon, 172:

“Who guides mortals to wisdom, makes them grasp lore
Firmly through their pain.”