Each of us will, in our own lives, face crisis. The stakes may be lower, but to us they will matter. A business on the brink of collapse. An acrimonious divorce. A decision about the future of our career. A moment where the whole game depends on us. These situations will call upon all our mental resources. An emotional, reactive response—an unthinking, half-baked response—will not cut it. Not if we want to get it right. Not if we want to perform at our best.