Treading the soil of the moon, palpating its pebbles, tasting the panic and splendor of the event, feeling in the pit of one's stomach the separation from Terra-these form the most romantic sensation an explorer has ever known . . . this is the only thing I can say about the matter. The utilitarian results do not interest me.
Vladimir NabokovTo a greater or lesser extent there goes on in every person a struggle between two forces: the longing for privacy and the urge to go places: the introversion, interest directed within oneself toward one's own inner life of vigorous thought and fancy; and extroversion, interest directed outward, toward the external world of people and tangible values.
Vladimir Nabokov