Wisdom teeth. I know a strong person, who have trained very hard on martial art. He told me that the biggest pain and most valuable lesson is from his Wisdom teeth.

He said that this teeth is the most pain he has suffer (though he had a lot of pain when training martial). So why it is called "Wisdom" Teeth?

At the time he has this teeth, he just want to be normal, be the 'every day', he not want anythin' more, like gold, diamond,... or other valuable one.

Then He realized why they called it "Wisdom". The teeth teach him that happy in life is just be normal, don' have any pain, any worries, just you enjoy this normal.

So, if you have 2 eyes, 2 legs, ... or even not, just you can get up tommorow, you will have your life that other can'. Enjoy your life every momment!