First
A mirror will reflect absolutely any object which comes before its surface, it will not refuse any object, all are equally accepted. 

Second
There exists no distinction between good and evil, big and small, beauty and ugliness for the mirror. The mirror reflects things as mountains and oceans, in the same way it will reflect a tiny insect. This is equality of acceptance, there exists no value judgment, definition or concept, only the object is reflected.

Third
The mirror reflects the mountain as a mountain, and the ocean as an ocean, it accepts things as they are without changing them.

Fourth
The mirror never keeps or sticks to a reflection after the object is removed. It returns to its peaceful state ready to reflect anything that comes up, not attached to anything.

Cultivate your mind like a mirror.