肇論新疏 3.359

3.359

豈可以有為便有為、無為便無為哉？菩薩住盡不盡平等法門，不盡有為、不住無為，即其事也。

How could one take the conditioned to be simply conditioned, and the unconditioned to be simply unconditioned? That the bodhisattva abides in the equal dharma-gate of the exhaustible and inexhaustible, not exhausting the conditioned and not abiding in the unconditioned, is precisely this matter.