Yogācārabhūmi-śāstra, Volume 34 (15)

Original text: 云何寻思内事支节。所作变异。无常之性。谓由观见。或自或他先时支节。无有缺减。后时观见支节缺减。或王所作。或贼所作。或人所作。或非人作。见是事已。便作是念。如是诸行。其性无常。余如前说。

Explanation: How does one contemplate the impermanent nature of the changes that occur in the limbs and joints of one's internal body? One sees that one's own or another person's limbs and joints were previously intact, without any loss, but later one sees that the limbs and joints have become deficient or lost. This may have been caused by a king's punishment, or by bandits during a robbery, or by other people, or by non-humans. After observing these phenomena, the following notion arises in the mind: such volitional formations are indeed impermanent in nature.