If you wish to know what these two are, they are originally one emptiness.

"This Emptiness is described in the following way: it is perfectly Harmonious, subject and object, Mind and Form are one. It is Pure and Undefiled; things are, just as they are, delivered from all stain of sin or imperfection. It is Unobstructed; all things are free,. interpenetrative. That is to say it is age-less, non-moral, law-less. It is like light, containing all colours in it, bur itself colourless. It is not a thing but contains all things; not a person but includes all minds; not beautiful or ugly but the essence of both.

"Sameness and difference are also one thing, yet two things. At one moment we see the separate meaning of a thing, at another, its meaning as being all things; and at some most precious moments of all, incommunicable in speech but yet heard also through it, we know that a thing, a person, a flower, the cry of a bird, is both one thing and all things. Sameness and difference, and their sameness and difference, are the same and yet different from our own non-existence."