摩訶止觀 3.53

3.53

又俗是所破，真是所用。若從所破，應言「俗諦觀」；若從所用，應言「真諦觀」。破、用合論，故言「二諦觀」。又分別有三種：一、約教，有隨情二諦觀；約行，有隨情智二諦觀；約證，有隨智二諦觀。初觀之功雖未契真，得有隨教、隨行，論二諦觀。

Furthermore, the worldly is what is refuted, and the true is what is employed. If based on what is refuted, it should be called the 'contemplation of worldly truth'; if based on what is employed, it should be called the 'contemplation of true truth'. Discussing refutation and employment together, it is called the 'contemplation of the two truths'. Moreover, distinguishing it, there are three kinds: first, in terms of teaching, there is the contemplation of the two truths following sentiment; in terms of practice, there is the contemplation of the two truths following sentiment and wisdom; in terms of realization, there is the contemplation of the two truths following wisdom. Although the efficacy of the initial contemplation has not yet tallied with the true, it may be discussed as the contemplation of the two truths in terms of following teaching and following practice.