But inner experience is only one source of human knowledge.

Your gut feelings aren't the whole truth

We live in an age that often treats personal experience like gospel. If something feels true to us, if we've lived through it, it seems obvious that we understand it. But Popper's point cuts against this comfortable assumption: your inner life—your gut feelings, your memories, your intuitions—can mislead you just as easily as it can illuminate.

The tricky part is that inner experience does matter. It's real data. The problem comes when you stop there. Think about why we get stuck in repeating the same relationship patterns, or why we're convinced our memory of an event is perfect when someone else remembers it differently. Our inner experience has blind spots. It's limited by what we've personally encountered, shaped by our fears and hopes, filtered through our existing beliefs. A scientist can feel absolutely certain about a theory based on preliminary results; a grieving person can be certain about what their loved one would have wanted.

This is actually liberating rather than depressing. It means you can test your inner convictions against reality. Talk to people who see things differently. Look for evidence that challenges what you already believe. Your instincts aren't worthless—they're just incomplete. The wisest people tend to be those who trust their experience while staying genuinely curious about what they might be missing.