Getting sick would teach me that my mind is my worst enemy and my best friend at the same time.
This is very true, being sick gives you too much free time, and we either play video games(if its not a physical injury) or think about some really deep philosophical stuff. If you're bed-ridden or caged in your house, its even worse because when you're finally out of it, you feel that a lot of things have changed or you've missed out on it.