As ordinary beings with far too many wanderings thoughts, discriminations, and attachments, we view everything dualistically. We do not view all phenomena as one. When our true wisdom manifests, we will know that all phenomena are one, not two.
Take the lid of a mug for example. It is concave on one side but it is convex on the other side. If people do not understand this truth, then two people standing on different sides of the lid will quarrel over whether the lid is concave or convex. This is because they look at the lid from different sides. When they see both sides of the lid, they will realize that concave is no different from convex. They are one, not two.
Bodhisattvas see both sides and are not attached to what they see. We see only one side, so we are attached to what we see. Eventually, when we see both sides, our wisdom will be perfect.
Buddhism teaches us to see every aspect of the Dharma Realms, space, worlds, all beings, all the mundane things that cloud our true nature. When we reach this state, everything will be harmonious.
~ Based on Ven. Master Chin Kung's 2003 lecture series on the Amitabha Sutra