阿彌陀經疏 1.163

1.163

問：「彼土是三界攝不？雖言無須彌山，而六欲天皆空居者，即是欲界攝，何得無實畜生乃是化也？」

Question: "Is that land included in the three realms or not? Although it is said that there is no Mount Sumeru, since the six heavens of desire all abide in empty space, it must be included in the realm of desire; how could it be that there are no actual animals, but only transformations?"