When deliberating on a negotiating strategy or approach, people tend to focus all their energies on what to say or do, but its how we are (our general demeanor and delivery) that is both the easiest thing to enact and the most immediately effective mode of influence. Our brains dont just process and understand the actions and words of others but their feelings and intentions too, the social meaning of their behavior and their emotions. On a mostly unconscious level, we can understand the minds of others not through any kind of thinking but through quite literally grasping what the other is feeling. Think

Never Split the Difference by Chris Voss