大般涅槃經集解 21.29

21.29

案僧亮曰：上云一切善法根本，人謂亦與如來為本。佛無師悟，非字所攝。名離文字，但言半者是不善、滿者皆善也。

Sengliang comments: Above it was said that [they are] the root of all good dharmas, so people might think they also serve as the root for the Tathāgata. The Buddha awakened without a teacher and is not subsumed by characters. This is termed being free from written characters, meaning only that the half is unwholesome and the complete is entirely wholesome.