a scar is an alteration of ourself left by an experience
our knowledge is stored in our scars tissues, it represent the memory storage in our body and mind.
scars tissues are markers illustrating the history of our live events.
Every event that touches us, leaves alteration behind: either a scar or simply a neural-chemical-tail, however in the end it all contributes to our knowledge capitalization.
There is somehow a great deal in learning though pain, it is entrenched in out lives from birth to death, it is the catalyst of our evolution.
With pain, comes an increased urgency to learn… ~Greg Young [b]
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[a]: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3883554/
[b]: http://www.studentofme.com/2011/03/personal-growth-through-pain-learning/
[c]: http://www.elephantjournal.com/2012/06/eight-things-i-learned-from-pain/
[d]: http://www.mindbodygreen.com/0-7479/do-we-need-pain-to-grow-can-we-learn-from-joy.html
[e]: https://www.youtube.com/watch?v=o2wCZBxAjgw