Someone told me that every decision we make in life is either to avoid pain or to gain pleasure. We ultimatley choose that which we desire the most. I basically agree with this statement, eg.1. I smoke because the pleasure of smoking outways the eventual pain. eg.2. You didn't ask that girl out because the pain of rejection outwayed the potential pleasure if she said yes (for those girls out there, please substitute girl for boy, or leave it girl if you wish).