In the Odyssey, Odyseuss left his homeland for 20 years. During his time away, even when he was living in rapture with Calypso indulging in all the pleasures known to man, he was overwhelmed with nostalgia. He longed for his home land, for the finite of the life he left two decades earlier. The greatest adventurer of all time turned out to also be the "the greatest nostalgic!"
When he finally was placed back on the shores of his beloved Ithaca, he was elated. But his ebullience was short-lived. After the initial high of his "Great Return" the people, most of whom he was unfamiliar with, began to detail to him the events which had occured in Ithaca while he was away. Nothing bored him more.
To be fair, the people spoke with the best intentions, but they failed to do the one thing that Odyseuss longed for. They never asked to hear about his adventures. They told and told and told but never said "Tell us!" And so, Odysseus came to the inevitable conclusion that most people who travel for an extended period of time do- that the dearest treasure of his life, its essence, significance, purpose was in the time spent outside the borders of his home. And the only way to relive that glory is by telling about it...