瑜伽論記 7.59

7.59

Bei says: If the inhalation starts from the nostrils and ends at the navel-circle, and the exhalation starts from the navel and reaches the nostrils, this is called 'occurring at such a place.' When the inhalation goes gradually from the nostrils to the navel, and the exhalation goes gradually from the navel to the nostrils, this is called 'occurring up to [such an extent].' When the inhalation and exhalation, operating from the nostrils, are followed in the places where the two breaths of exhalation and inhalation travel, this is called 'occurring in such a manner.' When the two breaths of inhalation and exhalation cannot operate because the mind is not steady, but they operate at other times when one follows them, this is called 'occurring at such a time.'