Even when you attain the state of living with God and merger in a divine form (sarupya-mukti), there is still a trace of differential feeling. Just because a devotee has a form like the Lord’s, one may not have the powers of creation, preservation, and destruction that the Lord has. Only when all trace of difference disappears and unity is attained, the highest stage is reached. This is real union (Sayujya). This comes of divine grace won by the essence of the spiritual practice of each; it cannot be claimed as the fruit of effort. The devotee wishes to serve the Lord as one pleases and to experience the joy of the form that one has attributed to the Lord. But the Lord, out of His grace, gives the devotee not only existence with the Lord, witnessing always the glory of the Lord, and being suffused with God-consciousness but also Sayujya - union with Him! The path of devotion results also in attainment of ultimate knowledge (Brahma-jnana). Even if the devotee does not crave it, the Lord Himself vouchsafes it to the devotee.

- Prema Vahini, Ch 54.