Kṛṣṇa's transcendental body is eternal, full of knowledge and bliss. Sat means ever-existing for all time and in all places; in other words, all-pervading in time and space. Cit means full of knowledge. Kṛṣṇa has nothing to learn from anyone. He is independently full of all knowledge. Ānanda means the reservoir of all pleasure. The impersonalists are seeking to merge into the Brahman effulgence of eternity and knowledge, but the major portion of the absolute pleasure which is in Kṛṣṇa is avoided by them. One can enjoy the transcendental blissfulness of merging into the Brahman effulgence after being freed from the contamination of material illusion, false identification, attachment, detachment and material absorption. These are the preliminary qualifications of a person who can realize Brahman. It is stated in Bhagavad-gītā that one has to become full of joyfulness; this is not exactly joyfulness, but a sense of freedom from all anxieties. Freedom from all anxieties may be the first principle of joyfulness, but it is not actual joyfulness. Those who realize the self, or become brahma-bhūta (SB 4.30.20), are only preparing themselves for the platform of joyfulness. That joyfulness can be actually achieved only when one comes into contact with Kṛṣṇa. Kṛṣṇa consciousness is so complete that it includes the transcendental pleasure derived from impersonal or Brahman realization. Even the impersonalist will become attracted to the personal form of Kṛṣṇa, known as Śyāmasundara.
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 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 members of 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, 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."