摩訶止觀 3.130

3.130

次、圓教，但明一實諦。《大經》云：「實是一諦，方便說三。」今亦例此，實是一諦，方便說三。《法華》云：「更以異方便，助顯第一義耳。」是為圓教二諦、三諦、一諦離合之相也。

Next, the perfect teaching only clarifies the one real truth. The Mahāparinirvāṇa-sūtra states: 'In reality there is only one truth; expedients teach three.' Here it is also like this: in reality there is only one truth; expedients teach three. The Lotus Sūtra states: 'Furthermore, by other expedients, one assists in revealing the ultimate truth.' This is the mark of separation and combination of the two truths, three truths, and one truth in the perfect teaching.