Every horse knows it can comply with it. Since we have said that confidence is knowing what is expected of you and knowing that you can comply with it, the simple herd dynamics law builds confidence or removes fear by allowing the horse to be part of a group that greatly increases its chances of survival. Membership in a herd means more eyes to watch for danger, more ears to listen for danger thus providing a degree of safety by allowing longer periods for sleep, eating and drinking and when fleeing danger he only has to run slightly faster than the slowest herd member. When a horse is a contributing complying member of the herd it has greater security. Basically, others are protecting you.
Many times fear promotes flight or spooking.
Where there is no fear, there is no spooking, there is no aggression. Now then it is not enough to verbally tell him with human words because he has no concept or understanding of human words and human thought processes. You must demonstrate to him that you have the ability to take whatever rights you want. If he cannot successfully challenge those actions he MUST honor them. The procedure I use that has come to be known to so many people around the world as Marv Walker's Bonder is not a horse and a human in a round pen.