釋禪波羅蜜次第法門 10.25

10.25

二、背捨者，壞內色，滅內色相，不壞外色，不滅外色相，以是不淨心觀外色，是第二背捨。所以者何？行者於初背捨中，骨人放光既遍，今欲入二禪內淨故，壞滅內骨人，取盡欲界見思未斷故，猶觀外白骨不淨之相，故云以是不淨心觀外色。

Second is the liberation in which one destroys internal form and eliminates the marks of internal form, while neither destroying external form nor eliminating the marks of external form, and with this impure mind contemplates external form: this is the second liberation. Why is this? Because for the practitioner in the first liberation, the skeleton's emission of light is already complete throughout; now, wishing to enter the internal purity of the second dhyāna, they destroy and eliminate the internal skeleton, taking it to its end. Yet because the delusions of view and thought of the desire realm are not yet severed, they still contemplate the external marks of the impurity of white bones; hence it is said: 'with this impure mind, one contemplates external form.'