瑜伽論記 2.41

2.41

The physical measurements of the form heavens share the difficult mind. That the physical measurement of Mahābrahmā does not double that of the previous is because, having or lacking limitless karmic fruit through investigation, it is difficult to surpass. That the Cloudless [Heaven] decreases by three is because the meditative absorption experiencing freedom from change is difficult to cultivate. The physical sizes of the three miserable destinies are unfixed, increasing or diminishing with karma; thus one knows that the physical measurement in the Unremitting [Hell] is not necessarily eighty thousand. However, where sūtras and śāstras state that they pervade the dimensions of the hell, they speak based on the maximum.