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 time; the second is harm by others; the third is depletion through use; the fourth is alteration by the seasons; the fifth is burning by fire; the sixth is rotting by water; the seventh is desiccation by wind; the eighth is encounter with altered conditions.

Storing over time means that for dharmas possessing form, even if they are placed in a suitable location and carefully preserved, after a long period of time they will still naturally decay and deteriorate, and their forms can be seen to have undergone decline and alteration. Harm by others means that various material forms, when struck or damaged by others in various ways, will undergo various alterations in their shapes and forms. Depletion through use means that various material objects belonging to different owners, due to the intensified force of the users' continued use, undergo wear and alteration.