淨名經集解關中疏 2.261

2.261

普守菩薩曰。我無我為二。我尚不可得非我何可得。見我實性者不復起二。是為入不二法門　肇曰。非我出於我耳。見我實性者我本自無。況於非我也。

The Bodhisattva Samantagupta said, "Self and non-self constitute duality. Since even the self cannot be obtained, how could the non-self be obtained? One who sees the true nature of the self does not give rise to duality again. This is entering the dharma gate of non-duality."
Sengzhao says, "The non-self arises only in relation to the self. For one who sees the true nature of the self, the self is fundamentally non-existent; how much more so the non-self!"