大般涅槃經集解 2.115

2.115

案僧亮曰：空觀也。色陰譬城，四陰譬人，諸見無過譬王，煩惱有過譬民也。

Sengliang states: "This is the contemplation of emptiness. The rūpaskandha is compared to a city; the four aggregates are compared to people; views without faults are compared to a king; afflictions with faults are compared to the subjects."