瑜伽師地論略纂 9.52

9.52

論解法性行故，觀無常性中云「謂即所有變異無常」等者，此中意，如現在樂受，正受樂時，未變異無常，以變異等前三種無常行故，觀今樂受於現在時雖未無常，法性於當來世必當此三種無常故，如是通達如是樂受於當來世必定無常。現世雖未無常，法性當來無常故。

In explaining the contemplation of impermanence through the aspect of true nature (dharmatā), the treatise says: "Namely, all the impermanence of alteration..." and so forth. The meaning here is: for instance, when present pleasant feeling is currently being experienced as pleasure, it has not yet undergone the impermanence of alteration; through the three aspects of impermanence mentioned before, such as alteration, one contemplates that although the present pleasant feeling is not yet impermanent at the present time, its true nature will certainly undergo these three kinds of impermanence in the future; thus one thoroughly penetrates that such pleasant feeling is definitely impermanent in the future. Although it is not yet impermanent in the present life, its true nature is impermanent in the future.