Ādi-līlā, Chapter 2
93
SYNONYMS
yat —that which;  advaitam —without a second;  brahma —the impersonal Brahman;  upaniṣadi —in the  Upaniṣads ;  tat —that;  api —certainly;  asya —His;  tanu-bhā —the effulgence of His transcendental body;  yaḥ —who;  ātmā —the Supersoul;  antaryāmī —indwelling Lord;  puruṣaḥ —the supreme enjoyer;  iti —thus;  saḥ —He;  asya —His;  aṁśa-vibhavaḥ —expansion of a plenary portion;  ṣaṭ-aiśvaryaiḥ —with the six opulences;  pūrṇaḥ —full;  yaḥ —who;  iha —here;  bhagavān —the Supreme Personality of Godhead;  saḥ —He;  svayam —Himself;  ayam —this one;  na —not;  caitanyāt —than Lord Caitanya;  krṣṇāt —than Lord Krṣṇa;  jagati —in the world;  para —higher;  tattvam —truth;  param —another;  iha —here.
TRANSLATION
What the  Upaniṣads  describe as the impersonal Brahman is but the effulgence of His body, and the Lord known as the Supersoul is but His localized plenary portion. He is the Supreme Personality of Godhead, Krṣṇa Himself, full with six opulences. He is the Absolute Truth, and no other truth is greater than or equal to Him.
PURPORT
The compilers of the  Upaniṣads  speak very highly of the impersonal Brahman. The  Upaniṣads , which are considered the most elevated portion of the Vedic literatures, are meant for persons who desire to get free from material association and who therefore approach a bona fide spiritual master for enlightenment. The prefix  upa  indicates that one must receive knowledge about the Absolute Truth from a spiritual master. One who has faith in his spiritual master actually receives transcendental instruction, and as his attachment for material life slackens, he is able to advance on the spiritual path. Knowledge of the transcendental science of the  Upaniṣads  can free one from the entanglement of existence in the material world, and when thus liberated, one can be elevated to the spiritual kingdom of the Supreme Personality of Godhead by advancement in spiritual life.
The beginning of spiritual enlightenment is realization of impersonal Brahman. Such realization is effected by gradual negation of material variegatedness. Impersonal Brahman realization is the partial, distant experience of the Absolute Truth that one achieves through the rational approach. It is compared to one's seeing a hill from a distance and taking it to be a smoky cloud. A hill is not a smoky cloud, but it appears to be one from a distance because of our imperfect vision. In imperfect or smoky realization of the Absolute Truth, spiritual variegatedness is conspicuous by its absence. This experience is therefore called  advaita-vāda , or realization of the oneness of the Absolute.
The impersonal glowing effulgence of Brahman consists only of the personal bodily rays of the Supreme Godhead, Śrī Krṣṇa. Since Śrī Gaurasundara, or Lord Śrī Caitanya Mahāprabhu, is identical with Śrī Krṣṇa Himself, the Brahman effulgence consists of the rays of His transcendental body.
Similarly, the Supersoul, which is called the Paramātmā, is a plenary representation of Caitanya Mahāprabhu. The  antaryāmī , the Supersoul in everyone's heart, is