維摩經玄疏 5.152

5.152

答曰：若明因通、果通，通教三乘；若教、若證，皆非不思議；若以別接通，教是思議，證是不思議；以圓接通，教、證皆是不思議也。

Answer: If one explains the shared cause and shared fruition of the three vehicles of the shared teaching, both the teaching and realization are not inconceivable. If one uses the distinctive [teaching] to connect with the shared [teaching], the teaching is conceivable and the realization is inconceivable. If one uses the perfect [teaching] to connect with the shared [teaching], both the teaching and realization are inconceivable.