The Hidden and Subtle Delusive Thoughts of the Aggregate of Volitional Formations in Volume Ten of the Śūraṅgama Sūtra

Original text:化理不住。运运密移。甲长发生。气销容皱。日夜相代。曾无觉悟。阿难。此若非汝。云何体迁。如必是真。汝何无觉。则汝诸行。念念不停。名为幽隐。第四妄想。

Explanation: The changes of the body have never ceased; moment by moment they are secretly moving and shifting. For example, the nails grow longer, the hair grows, the vital energy wanes, and the appearance becomes wrinkled. The body's various functions are being renewed and replaced day and night, yet one has never been aware of it. Ānanda, if this aggregate of formations were not you, why would your body undergo change? If this aggregate of formations were truly you, why have you not awakened to it or noticed it? Therefore, all your formations that do not linger even for a moment, thought after thought, are called the fourth subtle and hidden false thought.