"When the arch-spy finds a weak place in the wall of our castle, he takes care to plant his battering ram, and begin his siege. You may conceal, even from your dearest friend, your infirmity, but you will not conceal it from your worst enemy. He has lynx eyes, and detects in a moment the joint in your harness. He goes about with a match, and though you may think that you have covered all the gunpowder of your heart, yet he knows how to find a crack and to put his match through, and much mischief will he do, unless eternal mercy shall prevent." (From Spurgeon's sermon, Satan Considering the Saints).
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