摩訶止觀 3.108

3.108

又一一說各具四悉檀意。隨情中四意者，夫諦理不可說，說必寄言，言必契情，情必欣悅。或聞真歡喜；或聞俗歡喜；或聞中歡喜。此即是隨情中用世界悉檀意也。

Furthermore, each and every explanation possesses the meaning of the four siddhāntas. Concerning the four meanings within [the explanation] in accord with sentiments: the principle of the truths cannot be spoken; an explanation must rely on words; words must accord with sentiments; and sentiments will surely rejoice. Some, hearing of the true, are delighted; some, hearing of the conventional, are delighted; some, hearing of the middle, are delighted. This is the intention of using the worldly siddhānta within [the explanation] in accord with sentiments.