Charles H. Spurgeon on Psalms 81:14

I should soon have subdued their enemies. As he did in Egypt overthrow Pharaoh, so would he have baffled every enemy. And turned my hand against their adversaries. He would have smitten them once, and then have dealt them a return blow with the back of his hand. See what we lose by sin. Our enemies find the sharpest weapons against us in the armoury of our transgressions. They could never overthrow us if we did not first overthrow ourselves. Sin strips a man of his armour, and leaves him naked to his enemies. Our doubts and fears would long ago have been slain if we had been more faithful to our God. Ten thousand evils which afflict us now would have been driven far from us if we had been more jealous of holiness in our walk and conversation. We ought to consider not only what sin takes from our present stock, but what it prevents our gaining: reflections will soon show us that sin always costs us dear. If we depart from God, our inward corruptions are sure to make a rebellion. Satan will assail us, the world will worry us, doubts will annoy us, and all through our own fault. Solomon's departure from God raised up enemies against him, and it will be so with us, but if our ways please the Lord he will make even our enemies to be at peace with us.