Further, besides understanding the emptiness of all things both in regard to substance and self-nature, it is necessary for Bodhisattvas to clearly understand that all things are un-born. It is not asserted that things are not born in a superficial sense, but that in a deep sense they are not born of themselves. All that can be said, is this, that relatively speaking, there is a constant stream of becoming, a momentary and uninterrupted change from one state of appearance to another. When it is recognized that the world as it presents itself is no more than a manifestation of mind, then birth is seen as no-birth and all existing objects, concerning which discrimination asserts that they are and are not, are non-existent and, therefore, un-born; being devoid of agent and action things are un-born.

(The Lankavatara Sutra)