金剛經纂要刊定記 4.21

4.21

The beginning of receiving life is called "taking birth," which is the time of initial arising. The four differences such as egg are why it says "distinctions." Namely: born from within an eggshell, born from within a womb, born dependent on moisture, and suddenly born by transformation; therefore they are not the same. However, sentient beings of the three realms do not go beyond the five destinies, and using the four [births] to subsume the five is also complete. Therefore the commentary next says "transformationally born in the heavens and hells, etc.," which makes clear proceeding from the narrower to the broader.