Is something holding you back from your destiny?  Is it a financial, physical, emotional or mental issue.  We all have a thorn in our flesh that constantly nags at us.  Regardless of how many times we pray for God to remove it, it remains.  Maybe the reason you are still battling this problem is to make you stronger, more focused and teach you how to keep moving forward in your life in spite of it.  This thorn could also be there to keep you humble and dependent on God.