With duality comes separation, conflict and suffering.
The understanding of this concept may be facilitated by considering the story of Adam and Eve. God warned them against eating of the tree of the Knowledge of Good and Evil. Doing so set the stage for living in duality which led to conflict and suffering.
Also in a 3rd dimensional existence comes an incomplete awareness of the oneness of all. Many people have been aware for some time of the concept that we are all one, yet there are many indications that we do not really get it.
For instance, the confrontations we see in the world show that we see ourselves as separate from others. Even our illnesses indicate that our bodies see "self" and "other" and many illnesses are our bodies fighting off the "other." This is what allergies are all about. This is no one’s fault, it is just a repercussion of living in a 3rd dimensional world, a place of duality and separation.
In a fifth dimensional existence, oneness is obvious. Duality doesn’t exist. With that comes peace, harmony and unity. In this place every being is as pure as another. Everyone is still unique and continues to have their unique passions and purposes, yet the concept of better or worse doesn’t exist.
All of this may seem hard to visualize looking through 3rd dimensional eyes, however when oneness becomes clear the realization also comes that we truly are ALL part of the Divine Matrix and thus we each are as pure as God and as pure as one another.