"The limit at any given time is really only a taboo which can be shifted so that we slowly move toward what is absolutely impossible, something nobody can reach but which is the magic point that keeps adventure and uncertainty alive."   Reinhold Messner

"The mountain's summit must be inaccessible but its base accessible to human beings as nature has made them. . . .  The door to the invisible must be visible."  Rene Daumal, Mount Analogue