Wisdom in Strange Places (Ecclesiastes 9:13-18)

One would think that if they were saved from a dire consequence the amount of gratitude would be overwhelming.  Now, if our house was in danger of being destroyed you would think that we would be consumed with joy if someone saved it.  What if we liked our town and someone saved it?  We would probably want to have a parade and name a day after the individual who saved it all.  However, there is in instance where that did not happen.  Why was someone so significant forgotten?  What does such forgetting have to do with wisdom?