摩訶止觀 3.151

3.151

若別望通，通教兩得，俱是思議；別教兩得，俱不思議。若圓望別，別教教、道兩得，俱是思議。何以故？教門方便，或言無明生一切法；或言法性生一切法；或言緣修顯真修；或言真自顯。執此還成性過，墮可思議中也。若證道者，即不思議也。

If the distinctive is viewed against the shared, the shared teaching's two attainments are both conceivable, while the distinctive teaching's two attainments are both inconceivable. If the perfect is viewed against the distinctive, the distinctive teaching's doctrinal and realized attainments are both conceivable. Why is this? The expedient gates of teaching either state that avidyā gives rise to all dharmas, or state that dharmatā gives rise to all dharmas, or state that conditioned cultivation reveals true cultivation, or state that the true reveals itself. Grasping this turns back into the fault of inherent nature, falling into the conceivable. If one realizes the path, then it is inconceivable.