Pick up a book on a topic you know next to nothing about. Put yourself in rooms where you’re the least knowledgeable person. That uncomfortable feeling, that defensiveness that you feel when your most deeply held assumptions are challenged— what about subjecting yourself to it deliberately? Change your mind. Change your surroundings… An amateur is defensive. The professional finds learning (and even, occasionally, being shown up) to be enjoyable; they like being challenged and humbled, and engage in education as an ongoing and endless process.