Psalms 73:21

Behold Samson's riddle again unriddled, Out of the eater came forth meat, and out of the strong sweetness; for we have here an account of the good improvement which the psalmist made of that sore temptation with which he had been assaulted and by which he was almost overcome. He that stumbles and does not fall, by recovering himself takes so much the longer steps forward. It was so with the psalmist here; many good lessons he learned from his temptation, his struggles with it, and his victories over it. Nor would God suffer his people to be tempted if his grace were not sufficient for them, not only to save them from harm, but to make them gainers by it; even this shall work for good. I. He learned to think very humbly of himself and to abase and accuse himself before God (Psa 73:21, Psa 73:22); he reflects with shame upon the disorder and danger he was in, and the vexation he gave himself by entertaining the temptation and parleying with it: My heart was grieved, and I was pricked in my reins, as one afflicted with the acute pain of the stone in the region of the kidneys. If evil thoughts at any time enter into the mind of a good man, he does not roll them under his tongue as a sweet morsel, but they are grievous and painful to him; temptation was to Paul as a thorn in the flesh, Co2 12:7.

— Matthew Henry's Concise Commentary (public domain)