Yogācārabhūmi Śāstra, Volume 34 (9)

Original text:云何八种变异因缘。一积时贮畜。二他所损害。三受用亏损。四时节变异。五火所焚烧。六水所漂烂。七风所鼓燥。八异缘会遇。

积时贮畜者。谓有色诸法。虽于好处安置守护。而经久时自然败坏。其色衰损变异可得。他所损害者。谓种种色法。若为于他种种捶打。种种损害。即便种种形色变异。受用亏损者。谓各别属主种种色物。受者受用增上力故。损减变异。

Explanation: What are the eight causes and conditions of alteration? The first is storing over accumulated time; the second is harm inflicted by others; the third is depletion through use; the fourth is alteration due to the seasons; the fifth is burning by fire; the sixth is rotting from being soaked by water; the seventh is drying out from being blown by wind; the eighth is encounter of altered conditions (anyathā-pratyaya-samavāya).

The meaning of storing over accumulated time is that, for the various dharmas possessing form, even though they are placed and kept in a suitable location, after a long period of time they will still naturally decay and deteriorate, and their form will show signs of decline and alteration. The meaning of harm inflicted by others is that various material forms, if struck by others in various ways and damaged in various ways, will then undergo various alterations in shape and color. The meaning of depletion through use is that various material objects belonging to different owners, due to the intensified power of the users' employment of them, undergo wear and alteration.