What's the Enemy of Learning?

I want to ask one other question as we're sort of shifting towards the end of our time here together, which is another quote of yours that I'm like just so curious about. You said in one of the articles that you sent me ahead of time that certainty is the enemy of learning. Tell me more about this. Oh, what's that about that? Like, I was like, Oh, yeah, I'm writing that down. That's awesome.