"Mister, you never once hunted that dog rested." There's an old story about a man who paid top dollar for the best bird dog in the county. Papers, bloodline, the whole business. He ran the dog three fields in a morning, fed him off the table, and kept him up half the night riding around in the truck. The dog kept missing birds. So the man went back to find himself a better dog. The fellow who sold him the first one said, "Mister, you never once hunted that dog rested." Charlie Munger put it a different way. "I see these people doing three things at once, and I think, God, what a terrible way that is to think." At first, I figured that was just Munger being Munger. The more you think about the line, the more you realize how right he really is on this topic! Multitasking is the water we swim in now. Being smart doesn't save you from it. Sometimes smart is the curse. You get good enough at rationalizing that you stop checking the question, not just the answer. So what does the guy do after his prized hunting dog starts missing birds? He goes shopping. When the thinking comes out bad, we don't check the thinker. We fire the analyst. We buy the software. We bring in a consultant to fix the problem. Better dog. Meanwhile, you slept five hours, fought with your spouse in the driveway on the way out, and took nine calls, two LinkedIn pings, and four texts before you sat down and decided something with seven figures attached to it. You rarely feel it happening. A tired mind doesn't report that it's tired. It reports that it's fine, and the deal looks fine too. The instrument that would warn you something is off is the same instrument that's off. Before you shop for a better mind, check the shape the one you've got is in. Rest gets you back to zero. It doesn't finish the job. Focus on what you can control, as the Stoics taught us. What sits inside your hands is smaller and closer: the phone face down, the hour you actually protect to sit and think it through instead of reacting to it, the half-spent version of yourself that almost said yes anyway. Sort that part out, and the decision gets your real judgment instead of whatever was left of you by the time you sat down. Check the hunter before you shop for the dog.