仁王經疏 2.179

2.179

釋曰：第二、顯地別行。依真諦釋，雙觀二義：一入觀見真、二出觀見俗。出入合說，故云雙觀。慈恩三藏，一時雙緣故名雙觀。然此雙觀，略有四種：一方便雙觀，謂十迴向中，四善根位於一剎那緣名義等，假有實無，假有是俗、實無即真。於中初習，容有前後；若純熟位，即得雙觀。二證位雙觀，如即此經。三功用雙觀，謂難勝地。四任運雙觀，八地以上。今於此中，證位雙觀。

Commentary: Second, this reveals the specific practice of the bhūmi. Relying on Paramārtha's explanation, one dually contemplates two meanings: first, entering contemplation and seeing the ultimate; second, emerging from contemplation and seeing the conventional. Because entering and emerging are spoken of together, it is called "dual contemplation." The Tripiṭaka Master of Ci'en [says that] taking both as objects simultaneously is named "dual contemplation." However, this dual contemplation generally has four kinds: 1. Dual contemplation by skillful means: in the ten dedications, the stage of the four wholesome roots in a single ksana takes the names and meanings as objects, as provisionally existent and truly non-existent—provisional existence is the conventional, and true non-existence is the ultimate. In practicing this initially, there may be succession; but in the thoroughly matured stage, one immediately attains dual contemplation. 2. Dual contemplation of the realization stage, as in this sūtra. 3. Dual contemplation with effort, which refers to the Difficult to Conquer Stage. 4. Spontaneous dual contemplation, from the eighth bhūmi upward. Now in this context, it is dual contemplation of the realization stage.