Explanation:

Shankara stated in His commentary that devotion is the knowledge of God. He did not differentiate knowledge and devotion of God. Knowledge is thinking the nature of God through discussions involving intelligence. Devotion is thinking the qualities of God through mind. Both are different forms of the same worship and hence the difference disappears. On knowing the details of God (Knowledge), the interest on God (devotion) develops simultaneously and hence knowledge and devotion are inseparable forms of the same worship of God. Devotion and knowledge do not have any difference, once God is correctly detected. For detection of God only knowledge helps and not the devotion.