Success is a lousy teacher. It seduces smart people into thinking they can't lose.

Confidence is a trap for the certain

We tend to treat success like a victory that proves we've figured everything out. But the opposite is often true. When something works, we get confident—sometimes dangerously so. We stop asking the hard questions. We assume the conditions that got us here will stay the same. We become brittle.

This is especially true for smart people, which might sound backwards. Intelligence can actually work against you when things are going well. It gives you the language to rationalize staying the course, to explain away warning signs, to convince yourself that your past wins are predictive of future ones. History is full of brilliant strategists and companies that couldn't adapt because success had made them certain.

The real learning happens in failure, or at least in the friction of struggle. That's when you're forced to question your assumptions, to stay humble, to keep listening. The quieter message here is that success is worth less as feedback than we imagine. It tells you something worked once—not that you're invincible, and definitely not that you can stop paying attention.