Charles H. Spurgeon on Psalms 106:42

Their enemies also oppressed them. This was according to their nature; an Israelite always fares ill at the hands of the heathen. Leniency to Canaan turned out to be cruelty to themselves. And they were brought into subjection under their hand. They were bowed down by laborious bondage, and made to lie low under tyranny. In their God they had found a kind master, but in those with whom they had perversely sought fellowship they found despots of the most barbarous sort. He who leaves his God leaves happiness for misery. God can make our enemies to be rods in his hands to flog us back to our best Friend.