釋禪波羅蜜次第法門 9.67

9.67

復次，是苦受以事即是苦故，一切眾生所不欲；是樂受以為順情故，一切眾生所愛。若生貪著，無常敗壞，即現受眾苦，後受地獄、畜生、餓鬼等苦。如是等種種諸苦，皆從求樂生，故知樂即是苦。捨受雖復情中不覺苦樂，不取不棄，理實無常遷逼，亦為大苦。如是觀時，於三界中不見樂相可生貪著，心生厭畏，是名苦想。

Furthermore, because painful feeling is in fact suffering, all sentient beings do not desire it; because pleasant feeling accords with one's desires, all sentient beings crave it. If craving and attachment arise, when it decays through impermanence, one then experiences multiple sufferings in the present and subsequently experiences the sufferings of hells, animals, and hungry ghosts. Such various sufferings all arise from seeking pleasure; therefore one knows that pleasure is itself suffering. As for neutral feeling, although in one's feelings one does not sense suffering or pleasure, neither grasping nor rejecting, in actual fact its impermanent transition and affliction also constitute great suffering. When contemplating in this manner, one sees no aspect of pleasure within the three realms to which craving and attachment could arise; disgust and dread arise in the mind; this is called the notion of suffering.