淨名經集解關中疏 2.330

2.330

是淨是垢　此二定學。凡夫以愛心修禪定為垢。聖人無漏心修為淨也。

"This is pure, and this is defiled." (Second, the training in concentration. When ordinary people cultivate dhyāna concentration with an attached mind, it is defiled; when noble ones cultivate it with an outflow-free mind, it is pure.)