"This isn't a tale of derring-do, nor is it merely some kind of 'cynical account'; it isn't meant to be, at least. It's a chunk of two lives running parallel for a while, with common aspirations and similar dreams. In nine months a man can think a lot of thoughts, from the height of philosophical conjecture to the most abject longing for a bowl of soup – in perfect harmony with the state of his stomach. And if, at the same time, he's a bit of an adventurer, he could have experiences which might interest other people and his random account would read something like this diary."
(Ernesto Guevara, The Motorcycle Diaries)