法界次第初門 2.43

2.43

三、淨背捨身作證。淨者，緣淨故名淨。行者除外不淨相，但於定中練八色光明，清淨皎潔，猶如妙寶之色，故名緣淨。身作證者，以無受著心而受三禪中遍身樂，故名身作證也。

Third, the pure liberation realized with the body. 'Pure' is called pure because its object is pure. The practitioner removes the external marks of impurity and, solely within concentration, refines the radiance of the eight colors so that they are pure, bright, and immaculate, resembling the color of marvelous jewels; hence it is called taking the pure as object. 'Realized with the body' means that without a mind of attachment or clinging, one experiences the bliss that pervades the whole body within the third dhyāna; hence it is called realized with the body.