My parents used to give me advice when i was a kid , things like dont walk without socks on the cold floor tiles ,or wear a hat if it's snowing, take a umbrella when raining,etc. Well after catching many colds i never dismissed them anymore, and always tried to think deeply about any advice an elder would give me.I mean, you hear from a early age that some people have "experience" ,you understand the concept,but you don't really understand it until it happens to you.