釋禪波羅蜜次第法門 6.139

6.139

一、釋名者，不用處者，修此定時，不用一切內外境界。外境名空，內境名心，捨此二境因，初修得名，故言不用處。亦名少處，亦名無所有處，亦名無想處，此三名從定體得名也。

1. Explaining the name: as for 'the sphere of non-employment', when cultivating this absorption, one does not employ any internal or external cognitive objects. The external object is called space, and the internal object is called mind; relinquishing these two objects is the cause, and it gets its name from initial cultivation, hence it is called the sphere of non-employment. It is also called the sphere of the slight; it is also called the sphere of nothingness; and it is also called the sphere of non-ideation. These three names are derived from the absorption's essence.