How does the author use foreshadowing in Wind, Sand and Stars?

Several of the stories take place in the desert, where the extremity of conditions shape the men who live there into different men than any he has ever encountered and serve to test the author more intensely than he has ever been tested. The influence he and the other pilots exert on the desert men opens the nomad's awareness to the different world that lies beyond the boundaries of the desert and to the way freedom can change a man's life. This foreshadows a change in the personality of the men.