What are some signs that show a person has wisdom beyond just having information or book knowledge?

I had a guest over for dinner. When we were done, I set down plates for my dog to lick. I told her I never use a sink or a dishwasher, I let my dog lick them clean. Why did she freak out?
What's a good way to handle conversations with someone who has a lot of knowledge but lacks humility?
What makes some people feel certain about their supernatural experiences while others remain skeptical?