"<a href=""https://www.youtube.com/watch?v=hppbxV9C63g&amp;t=1h48m00s"">1:48:00</a> If your personality is "stable over time" then how do you suppose you can merely "decide" to lose weight", or work harder, or "straighten up and fly right"? Do you think those things are divorced from your "personality"? You are who you are, and you had no ultimate control in who you are. We don't have free will... you should read about that more.