Wisdom sometimes is the byproduct of the mistakes we make, learning through the experiences we have in life. The old adage that wisdom comes with age kind of points that exact line of reasoning. As we go through life and grow older we make many mistakes, if we learn by those mistakes then we gain wisdom. Though there is many forms wisdom may come in and many sources for wisdom to spring from, learning through trial and error is the most common.
Learn from you experiences of life and try not to repeat the mistakes of your past. Forgive all and forget the pain associated with the mistakes of both yourself and others. For pain from your past is but a weight around your neck that slows you down and a roadblock to happiness in the here and now.
Live and Learn, Forgive and move forward. Be who you are truly meant to be.