A selective memory is the greatest asset of any traveller or adventurer.

When the mist comes in and you can’t find the path, you tell yourself, as you have done so often before, that you will never return to these wretched slopes, jungles, streets again.

And when you do return home, this deft attribute blots out the hardship and the fear and you begin to plan again to go where you have not travelled before.

Peter Hillary, from Journeys: Timeless Travel Quotations