肇論新疏 2.139

2.139

成前相與而有、相與而無。妄智以能分別所知之境，一一於境取相。相既妄起，心亦妄生。真則反此，故曰無知。對妄辨真，義意昭然。

This accomplishes the preceding "mutually exist and mutually do not exist." Because deluded wisdom can discriminate the known object, it grasps marks with respect to each and every object. Marks having arisen through delusion, the mind is also born through delusion. The true is the reverse of this, hence it is called non-knowing. Distinguishing the true against the deluded, the meaning and intention are distinctly evident.