" My shoulders are dropped back, my face is tensed, my eyes narrowed. It is difficult to keep from overdoing it at first, hard to recall how I had managed all those years ago, but I soon find the right register. The trick is to present an outward attitude of alertness, while keeping a calm and observant mood within. And there also has to be the will to be violent, a will that has to be available when it is called for. "

― Teju Cole , Every Day Is for the Thief