We know about yesterday                                                                                       Simply because we experienced it                                                                           Willingly or unwillingly ,                                                                                         We know a little bit about today                                                                             Simply because we're still experiencing it                                                              Willingly or unwillingly ,but                                                                                   We don't know anything about tomorrow                                                             Simply because we will experience it                                                                     Willingly or unwillingly anytime ...