大方廣佛華嚴經疏 3.6

3.6

Eighth, the essence of the non-obstruction between noumenon and phenomena: this means that although all teachings in their entire essence are the real, this does not obstruct the twelve divisions and other phenomenal marks from being clearly manifest. Although tathatā in its entire essence constitutes all [dharmas], this does not obstruct the single flavor of serene equality. Because tathatā is unobstructed, the Buddha's sounds also accord with tathatā without obstruction, for all are associated with the wisdom of tathatā. This is as explained in detail in the previous [section on] the scope of meaning.