“I am acutely aware that I am now the middle-aged traveler that I used to consider to lame, so embarrassing. And I have something to say to my 20-year-old self:You cannot possibly know how much time it takes to learn to treasure this world, how many years it takes to properly cherish your place in it.As you age, you will find it more and more remarkable, a miracle really, that any of us -- you, me -- are here at all, the result of an undeserved, infinite gift.And the older you get, the more you know how much you will miss all this when you are gone. In the end, the world was not all that changed by your coming, you were not all that crucial to it. But the world, this world, which you will one day travel in homage and gratitude, this world was everything to you.”