瑜伽論記 18.439

18.439

言有無常、非苦，謂道諦等者，道非苦受故非苦苦，道非愛別離變壞，亦非求不得境變壞。又變壞有二：一、樂受變壞生苦；二、愛壞生苦，道非愛壞生苦故非壞苦。此文即證緣生苦名為壞苦，其若依成實一道諦無常是苦諦，若依薩婆多，道諦生順聖人意故非苦也。

As for the statement 'there is what is impermanent but not suffering, referring to the truth of the path and so forth': the path is not a painful feeling, so it is not the suffering of suffering; the path is not the deterioration of separation from what is loved, nor is it the deterioration of an object when failing to obtain what is sought. Furthermore, deterioration is of two kinds: first, the deterioration of pleasant feeling generates suffering; second, the destruction of what is loved generates suffering. The path is not the arising of suffering from the destruction of what is loved, so it is not the suffering of change. This passage proves that suffering arisen from conditions is called the suffering of change. If based on the Tattvasiddhi, the impermanence of the single truth of the path is the truth of suffering; if based on the Sarvāstivāda, the arising of the truth of the path accords with the intention of the noble ones, so it is not suffering.