俱舍論疏 8.56

8.56

論「如是三界唯有一耶」，問也。此下問答一多界等，於中有二：一問一多、二問傍竪。此問初也。

On the Śāstra's question: "Are these three realms only one?": this is the question. From here on are questions and answers on the unity or multiplicity of realms and so forth, within which there are two parts: first, inquiring about unity and multiplicity; second, inquiring about horizontal and vertical arrangement. This asks the first.