Newton's Third Law of Motion says that if a body A exerts a force on body B, then the body B exerts a force of equal magnitude, in the opposite direction, on the body A. Often, one of these forces is called "action" and the other one "reaction".
Opening the third eye means practicing using your sixth sense. The trick is learning how to accept it is there and then interpret what you are sensing over time. The bigger problem is all too many people force the process and then get overwhelmed by stories, yes stories! More interestingly, the third eye is the only sense that shows us stories.