六妙法門 1.35

1.35

復次，行者當數息時，成就息念巧惠方便，用靜鑒之心，照息生滅；兼知身分、剎那思想、陰入界法，如雲如影，空無自性，不得人法，是時於數息中成就息念巧惠觀門。

Furthermore, when the practitioner counts the breath, achieving the skillful wisdom and expedient means of mindfulness of the breath, using a mind of tranquil examination to illuminate the arising and perishing of the breath, and concurrently knowing that the parts of the body, momentary thoughts, and the dharmas of the aggregates, sense realms, and sense bases are like clouds and like shadows, empty and devoid of inherent nature, with no person or dharma to be apprehended—at that time, within counting the breath, one achieves the gate of skillful wisdom contemplation through mindfulness of the breath.