It is confirmed by the statement of Brahma-saṁhitā that the Brahman effulgence is the bodily ray of Kṛṣṇa; the Brahman effulgence is simply an exhibition of the energy of Kṛṣṇa. Kṛṣṇa is the source of the Brahman effulgence, as He Himself confirms in the Bhagavad-gītā. From this we can conclude that the impersonal feature of the absolute truth is not the ultimate end; Kṛṣṇa is the ultimate end of the absolute truth.
The Vaiṣṇava schools therefore never try to merge into the Brahman effulgence in their pursuit of spiritual perfection. They accept Kṛṣṇa as the ultimate goal of self realization. Therefore Kṛṣṇa is called parambrahman (the supreme Brahman) or parameśvara (the supreme controller). Śrī Yāmunācārya has prayed as follows: "My dear Lord, I know that the gigantic universe and gigantic space and time within the universe are covered by the ten layers of the material elements, each layer ten times larger than the previous one. The three material modes of nature, the Garbhodakaśāyī Viṣṇu, the Kṣīrodakaśāyī Viṣṇu and the Mahā-Viṣṇu, and beyond them the spiritual sky and its spiritual planets, known as Vaikuṇṭhas, and the Brahman effulgence in that spiritual sky—all of these taken together are nothing but a small exhibition of Your potency."
55. Possessing All Mystic Perfections
There are many standards of perfection. The highest material perfections, obtained by perfect yogīs, are listed as eight: to become the smallest of the small, to become the greatest of the great, etc. All of these material perfections, as well as all spiritual perfections, can be found fully in Kṛṣṇa's personality.