釋禪波羅蜜次第法門 7.56

7.56

Furthermore, perceiving the breath to be long, the mind is subtle; perceiving the breath to be short, the mind is coarse. Why is this? When the mind is subtle, the breath is subtle; when the breath is subtle, it enters from the nose to the navel, faintly, gently, and long, and the exhalation from the navel to the nose is likewise. When the mind is coarse, the breath is coarse; when the breath is coarse, it enters from the nose to the navel rapidly and short, and the exhalation from the navel to the nose is likewise.