六妙法門 1.70

1.70

復次，行者當數息時，內外死屍不淨，膖脹爛壞及白骨光明等，定心安隱，當知於數息中，證觀門禪也。

Furthermore, when a practitioner is counting breaths, if internal and external corpses, impurity, swelling, rotting away, the radiance of white bones, and so forth appear, with the concentrated mind peaceful and steady, one should know that while counting breaths, he realizes the dhyāna of the gate of contemplation.