Disclaimer: This translation does not guarantee complete accuracy, please confirm with the original page text.
129
Chapter 2 - 2349 Pre - One should examine the karmic body with such subtlety, which is not sensory and not composed of elements like light; it can still undergo enjoyment because it is the root of all other bodies. Therefore, when observing the enjoyment of other bodies, one should consider it as the enjoyment of karmas; then why is it called "nirupabhoga"?
In a way of understanding, that karma is also a type of upabhoga. Here, it is meant to say that as long as other bodies are not supportive, the individual karmic body cannot attain enjoyment alone. In other words, the specific upabhoga requires the direct support of the four bodies, namely: the gross body and others. Therefore, they are referred to collectively as fourfold upabhoga; and since it traditionally serves as a means, the karma is called nirupabhoga. [45 - Regarding the distinction between birth-acquired and artificial: Ultimately, one also questions how many bodies are birth-acquired and how many are artificial? And which body among the birth-acquired comes into existence from which birth and what is the cause of the artificial? Answers to this are given in four sutras.
Tejas and karma are neither birth-acquired nor artificial; meaning they occur even after birth, yet are beginninglessly connected, only birth-acquired in nature; they arise in both embryo and complete forms. Only human and animal beings possess this. The vaikriya body has both birth-acquired and artificial types. What is birth-acquired is upapāta.