गोविन्द भाष्य (श्रील बलदेव विद्याभूषण - अचिन्त्यभेदाभेद वेदान्त ब्रह्मसूत्र भाष्य सटीक)

"Sitting in a yoga posture, and rapt in meditation, the sages gazed at the Supreme Personality of Godhead." In this way they who desire to meditate on the Lord are described. Therefore one should adopt the āsana posture. Otherwise meditation is not possible. Sūtra 8 dhyānāc ca dhyānāt—because of meditation; ca—also. Also because of meditation. Purport by Śrīla Baladeva Vidyābhūṣaṇa Meditation is defined as thinking of one thing only and not thinking of anything else. This kind of thinking is not possible when one is reclining or in any posture but the yoga āsana. Therefore one should sit in the yoga āsana. Sūtra 9 acalatvaṁ cāpekṣya acalatvam—stillness; ca—and; apekṣya—in relation to. Also because it is related to stillness. Purport by Śrīla Baladeva Vidyābhūṣaṇa The word "ca" (also) is used here for emphasis. In the Chāndogya Upaniṣad the word "dhyāna" (meditation) is used as a synonym of "stillness". There it is said (Chāndogya Upaniṣad 7.6.1): dhyāyatīva pṛthivī