Yogācārabhūmi-śāstra, Volume 34 (62)

Original text: 如是勤修瑜伽行者。观心相续展转别异。新新而生。或增或减。暂时而有。率尔现前。前后变易。是无常性。观心相续入取蕴摄。是为苦性。观心相续。离第二法是为空性。观心相续。从众缘生。不得自在。是无我性。如是名为悟入苦谛。

Explanation: A yogi who diligently cultivates in this way observes the continuous stream of his own mind flowing and transforming without cease: a new dharma arises in the mind, and the next moment yet another new dharma is born, constantly changing. The mind sometimes increases and sometimes decreases; all of it exists only temporarily, manifesting in an instant and then changing afterward. Such a mind, changing from before to after, has the nature of impermanence. Further, observing that the continuous stream of one's own mind involves grasping and clinging, and is subsumed within the aggregates of grasping (upādāna-skandha), this is the nature of suffering. Further, observing that the continuous stream of one's own mind does not belong to any single dharma—because the mind is empty—this is the nature of emptiness. Further, observing that the continuous stream of one's own mind arises from the conjunction of many causes and conditions, and lacks self-mastery, this is therefore the nature of non-self. This is called entering into realization of the truth of suffering: impermanence, suffering, emptiness, and non-self are named the truth of suffering.