坐禪三昧經 2.94

2.94

If a practitioner attains such right knowledge and vision, he contemplates the twelve links, combining them into the two divisions of cause and fruit: as fruit, the twelve links are the truth of duḥkha; as cause, the twelve links are the truth of origination; the cessation of causes is the truth of cessation; and seeing the cessation of cause and fruit is the truth of the path. One contemplates the fruit in four ways: impermanence, duḥkha, emptiness, and non-self. One contemplates the cause in four ways: origination, cause, condition, and arising.