There are three different processes by which Kṛṣṇa can be understood: the empiric process of philosophical speculation, the process of meditation according to the mystic yoga system, and the process of Kṛṣṇa consciousness, or devotional service. By philosophical speculation, the impersonal Brahman feature of Kṛṣṇa is understood; by meditation, or mystic yoga, the Supersoul, the all-pervading expansion of Kṛṣṇa, is understood; and by devotional service in full Kṛṣṇa consciousness, the original Personality of Godhead, Kṛṣṇa, is realized. In this connection, Lord Caitanya quoted a verse from Śrīmad-Bhāgavatam (1.2.11):
- vadanti tat tattva-vidas tattvaṁ yaj jñānam advayam
- brahmeti paramātmeti bhagavān iti śabdyate
"Those who are knowers of the Absolute Truth describe the Absolute Truth in three features: the impersonal Brahman, the localized, all-pervading Supersoul, and the Supreme Personality of Godhead, Kṛṣṇa." In other words, Brahman, the impersonal manifestation, Paramātmā, the localized manifestation, and Bhagavān, the Supreme Personality of Godhead, are one and the same. But according to the process adopted, He is realized as Brahman, Paramātmāor Bhagavān.
By realizing the impersonal Brahman, one simply realizes the effulgence emanating from the transcendental body of Kṛṣṇa. This effulgence is compared to the sunshine. There is the sun-god, the sun itself, and the sunshine, which is the effulgence of that original sun-god. Similarly, the spiritual effulgence (brahmajyoti), the impersonal Brahman, is nothing but the personal effulgence of Kṛṣṇa.