坐禪三昧經 1.59

1.59

"Having mastered the method of counting, one should practice the method of following to sever all discursive thoughts: when an inhalation reaches its end, one should follow it and not count one; when an exhalation reaches its end, one should follow it and not count two. It is like a creditor who follows behind a debtor, never departing from him. One reflects in this way: Does this inhalation go back out, or is there another different one? Does this exhalation go back in, or is there another different one? At this time, one knows that the inhalation is different and the exhalation is different. Why is this? The exhalation is warm, and the inhalation is cool."