A sobering reminder from Paul Tripp:
There’s loads of knowledge to be found, but wisdom is a rare commodity. Why? Because wisdom is one of sin’s first casualties. It’s hard to admit, but true none the less, that sin reduces all of us to fools. And the fact is that no one is more victimized by your foolishness than you are. You see the empirical evidence of the foolishness of sin on almost every page of Scripture. For example, you see foolishness in full operation in the tragic story of David and Bathsheba. This is why David says, “Surely you desire truth in the inner parts; you teach me wisdom in the inmost place” (v. 6 NIV).
You read the story of David’s sin, and you say to yourself, “What was he thinking? Did he really believe that he’d get away with that? Did he completely forget who he was? Did he think that God was going to stand idly by and let this happen?” But David is not some extreme case of foolishness gone wild; you see evidence of the same foolishness in each of our lives daily. People could say of us again and again, “What was he thinking? What was she thinking?”
What does foolishness look like? Here are four of its most significant aspects.

