Yogācārabhūmi Śāstra, Volume 34 (34)

Original text:如是一切外事诸行。前之六种是所摄受事。后之十种是身资具事。以要言之。当知其性皆是无常。何以故。形相转变现可得故。由如是等如前所说。

Explanation: Thus, all these external matters and conditioned things—the former six kinds are matters grasped and received by the five-aggregate body, and the latter ten kinds are matters concerning the necessities the body requires. In summary, the nature of all these dharmas is impermanent. Why is it said this way? Because the transformations of the forms and marks of these dharmas can be directly observed in the present, just as was specifically described earlier.