美國火車旅行家保羅.索魯(Paul Theroux)在他一本叫做《旅行之「道」:旅途生活中得到的證悟》裡面說的:「之於我而言,對旅行的渴望定義了『人』之所以為人的原因:對移動的慾望,對好奇心的滿足,不再如此恐懼,改變人生的現狀,去當一個陌生人,去結交朋友,去體驗未知的地貌,對未知願意冒險。」(“The wish to travel seems to me characteristically human: the desire to move, to satisfy your curiosity or ease your fears, to change the circumstances of your life, to be a stranger, to make a friend, to experience an exotic landscape, to risk the unknown.”)