仁王般若經疏 3.54

3.54

時佛為王下，品中第四神力現五不思議，即為五別：第一華變不思議，一華入無量者，少能入多；無量入一者，多能入少，故皆不思議神力也。二佛土不思議，無量佛土入一佛土，能變多土入一土故。三毛吼不思議，少能容多故。四須彌大不思議，多能入芥子故。五眾生不思議，無量眾生入一佛身故。五種神通稱不思議者，無得正觀之異名也。

"At that time, the Buddha, for the kings..." onwards is the fourth [major section] in the chapter, the supernatural power displaying the five inconceivables, which comprises five distinctions: First, the inconceivable flower transformation: that one flower enters into immeasurable ones is the few entering the many; that immeasurable ones enter into one is the many entering the few; hence both are inconceivable supernatural powers. Second, the inconceivable buddha-lands: immeasurable buddha-lands enter into a single buddha-land, because it can transform many lands to enter into one land. Third, the inconceivable hair-pores, because the small can contain the great. Fourth, the inconceivable greatness of Sumeru, because the many can enter into a mustard seed. Fifth, the inconceivable sentient beings, because immeasurable sentient beings enter into a single buddha-body. That these five supernatural powers are termed 'inconceivable' is another name for the correct contemplation of aprāptitva.