The most important mind-changers aren't nuggets you'll note in a TED talk or even lessons you'll learn from a book. They're experiences that change who you are.
No matter how well you know a thing now, it will likely look different to you someday, after your next existential transition.
Walking 6,000 miles with Bo has taught me at least a couple of things.
If you want to understand yourself better, ask your father. He's an expert on the subject of you.