I guess no human being in this world could have a meaningful existence without having a purpose or purposes. Purpose give us direction. Maybe this is why Rick Warren is so successful with Purpose Driven Church, and Purpose Driven Life.
By the way, have we seen anybody without a purpose ? I guess that person will be wandering aimlessly. So we can say anyone must have a purpose.The only thing is it could be bad or good purpose. So a bad purpose is almost same as no purpose.
According to Warren who based on the Bible the five main purposes of man are worship , fellowship, discipleship, ministry and mission. Even these five purposes could go wrong if placed on the wrong direction. As a human being where are you focusing your purposes if I may ask ? Could you honestly say your purposes are eternal ?