공 (空)을 본체와 작용으로 관찰한 것) 1) 내공 (內空). 2) 외공( 外空). 3) 내외공 (內外空). 4) 공공( 空空). 5) 대공 (大空). 6) 제일의공( 第一義空). 7) 유위공 (有爲空). 8) 무위공 (無爲空). 9) 필경공 (畢竟空). 10) 무시공 (無始空). 11) 산공 (散空). 12) 성공 (性空). 13) 자상공 (自相空). 14) 제법공 (諸法空). 15) 불가득공( 不可得空). 16) 무법공 (無法空). 17) 유법공 (有法空). 18) 무법유법공 (無法有法空).

The eighteen aspects of emptiness: Emptiness is classified into two categories of principle and function. 1) Internal emptiness. 2) External emptiness. 3) Internal-external emptiness. 4) Emptiness of emptiness. 5) Great emptiness. 6) Primal emptiness. 7) Phenomenal emptiness. 8) Non-phenomenal emptiness. 9) Ultimate emptiness. 10) Beginningless emptiness. 11) Disseminating emptiness. 12) Emptiness of nature. 13) Emptiness of self-mark. 14) Emptiness of all Dharmas or things. 15) Unattainable emptiness. 16) Emptiness of nonexisting Dharma. 17) Emptiness of existing Dharma. 18) Emptiness of non-Dharma and Dharma.