The "form" here has to do with how one behaves and comports oneself. Which is related to our distinct belief about utter reality of the Presence of Jesus Christ in the Eucharistic bread and wine.
Behavior follows belief, but behavior can also teach belief. If we teach our people to show respect for the Eucharist, then they will more easily understand that we believe it is Christ Present.
Put it this way: If you truly belieed that God was making Himself physically Present in your midst would you stand or fall to your knees?
SD