What are the dashes in this for in this?
"Many go through life worrying about the future or haunted by the past. Don't worry about the future-about things that may never happen-about things you don't have control over. Don't worry about the unchangeable past. Don't rehearse or playback the hurts & pain of yesterday. Don't anticipate trouble,pain or loss. Let go of the past. Live in the moment one day at a time" What are the dashes used for when talking about the future and why didn't they use them when talking about the past?