"It's OK to be wrong. You learn from your wrongs. You don't learn from being right. If you're right, you already know it. If you're wrong, it's because you don't know about it, and you made a mistake."

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Most of what we know we don't really know first hand. I've never seen a cancer cell. But I trust this community of experts who have, so I believe that cancer exists. But we trust these experts, and we trust that the experts have a system of checks and balances and self-correction. And we have to insist that experts have certain certifications. They're not perfect. Every once in awhile there's an engine falls off the wing of a plane, or a tax audit happens and you find out your expert made a mistake. But it's a pretty good system. It's the best system we've got.

— Daniel Levitin