The last line in Lawrence of Arabia says it all. When Lawrence looks at the bedouis taking the road on their camels as he is himself driven "home", he knows that there is no home for him anymore. Once he chose the desert and the Arabs over his own culture, how could he ever return home? He became a nomad, renouncing all attachments. And the rest of his life after the desert experience will be just about reafferming his ability to abandon something.
David Lean's movie is quite romancing what truly happened but what a brilliant romance! Each word of the script breathes intelligence. When I was 16 or 17, I got enamoured with that line in particular: "El Aurens, truly for some men nothing is written unless they write it". It's funny how little things like that can be inspiring, for so long.