When we think about it we cannot even possess ourselves as each moment changes us. Our mind, body, spirit, and emotions are ever changing from moment to moment. Nothing stays still.
If we cannot possess ourselves then we really cannot posses anything. We coexist with an ever changing environment, with other people and life forms that are constantly changing. What can we say is fixed and unchanging.
Yet some of us want the world to be unchanging and ignore what is happening around them when it is inconsistent with their mental world. They live in a mental bubble.
The worlds of our mind is our reality but we need to understand that only we live in that world and no one else can see it the way we do. Understanding and acceptance comes from realizing this fact and accepting others as they are; in their own dream world.
Communication is the key to having others understand us and we to understand them. Sometimes we have to realize that we need to give them an understanding of where we are coming from for acceptance of our ideas. Also that we need to ask them when we don't understand them rather than dismissing them out of hand.