«…One says of any great subject as yet untackled—Mexico, for instance—Oh, that’s such a big undertaking, that’s going to need such preparation. Then something happens and you just have to go in there anyway, in all your ignorance. What happens next is you acquire a little piece of knowledge, a little amount of experience, and this experience is your bridgehead.»
http://www.nybooks.com/blogs/nyrblog/2015/feb/25/what-i-mean-mexico/?insrc=wbll