“The most valuable skill of a successful entrepreneur … isn’t ‘vision’ or ‘passion’ or a steadfast insistence on destroying every barrier between yourself and some prize you’re obsessed with. Rather, it’s the ability to adopt an unconventional approach to learning: an improvisational flexibility not merely about which route to take towards some predetermined objective, but also a willingness to change the destination itself. This is a flexibility that might be squelched by rigid focus on any one goal.”