Wisdom Is Never Found in Certainty
As Jeff Bezos says, "the smartest people are constantly revising their understanding, reconsidering a problem they thought they'd already solved. They're open to new points of view, new information, new ideas, contradictions, and challenges to their own way of thinking."
That's because wisdom isn't found in certainty. Wisdom is knowing that while you might know a lot, there's also a lot you don't know. Wisdom is trying to find out what is right rather than trying to be right. Wisdom is realizing when you're wrong, and backing down graciously.
Don't be afraid to be wrong. Don't be afraid to admit you don't have all the answers. Don't be afraid to say "I think" instead of "I know."