成唯識論演祕 1.204

1.204

略為二釋：一而伏煩惱所顯之理，是真涅槃之少分故，故名彼分。二云，即四禪等所有淨定，由伏煩惱有寂靜義名為涅槃，以是有為，故名彼分。分者，相似流類之義；據無惑邊有寂靜義，與真涅槃稍相似故，故名彼分。故《瑜伽論》第十二云：四靜慮者或復名為彼分涅槃，由諸煩惱一分斷故，非決定故，名彼分涅槃。後解為本，前雖無文，理可通也。

Briefly, there are two explanations: First, because the truth revealed by suppressing afflictions is a small part of true nirvāṇa, it is called "partial." Second, it is said that all pure concentrations of the four dhyānas and so forth, because they suppress afflictions, possess the meaning of tranquility and are called nirvāṇa; because they are conditioned, they are called "partial." "Part" means having the sense of a similar category: in terms of the aspect of being without delusion, they have the sense of tranquility and are somewhat similar to true nirvāṇa; therefore, they are called "partial." Thus the Yogācārabhūmi, fascicle 12, states: "The four dhyānas are also called partial nirvāṇa, because a part of the afflictions is severed and because it is not decisive, they are called partial nirvāṇa." The latter explanation is the fundamental one; although the former lacks textual authority, its principle is admissible.