You cannot experience your own error in the present tense

Schulz identifies what she treats as a foundational quirk of human cognition: the statement "I am wrong" describes something logically impossible to experience directly, because the instant you recognize a belief as false, you've already stopped holding it. You can only ever say "I was wrong," looking backward at a version of yourself that no longer exists in the same way. This means every one of us walks around with active, unexamined false beliefs that feel every bit as solid and self-evident as our true ones, since there's no internal alarm that distinguishes a soon-to-be-wrong belief from a correct one while we're still holding it. Schulz calls this error-blindness, and argues it explains why humans default to assuming they're right about nearly everything, not out of arrogance exactly, but because feeling certain is simply what believing something, true or false, feels like from the inside.

Takeaway: the feeling of certainty is not evidence of correctness — it's just what belief feels like, whether or not it's justified.