阿彌陀經要解 1.137

1.137

上方者，此界非非想天之上，復有上界風輪、銀輪及三界等，重重無盡不可說不可說也。

As for the zenith: above the Heaven of Neither-Perception-Nor-Non-Perception of this world realm, there are further upper realms, the wind disc, silver disc, the three realms, and so forth, layer upon layer endlessly, ineffable and ineffable.