When you are in the world of the thinking mind, you are somewhere in the remembered past or the imagined future. You are in a world of thought, memory, concept, idea, opinion and belief. You are not here now. What you are experiencing is not of the present moment. It is not real. You are in a world of illusion... and yet you have come to believe that it real. Almost the entire human population is lost in this illusion. It is the sole source of our suffering.