Experience

"A person who never made a mistake never tried anything new."

                             -Albert Einstein 

It shows that not one person is perfect and in order to get somewhere in life, you'll have to make mistakes down the road. Until you slip out of your 'personal bubble', you'll miss individual shots in life that you didn't in the least risked, not undergoing. Whether or not they be good or bad choices, it's about taking chances while not expecting anything and just doing it. They always teach a lesson, having you think twice, making you for the better. Confronting doubt is like facing your fear of heights, when you decide to take the leap, the out-come is completely worth it. A person would never know if they could have made the world's greatest discovery known to man kind, because he didn't attempt to. The worst possible feeling is that you had no intention of effort at all.