How to Approach God
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are, indirectly, expansions of the expansions of Krishna. But the Krishna Name mentioned there is the Original Personality of Godhead, and He appears on this Earth, in this Universe or in any other Universe, when there is a disturbance created by the demons, who are always trying to disrupt the administration of the demigods.
To understand Krishna there are three different processes: the process of empiric philosophical speculation, the process of meditation in the mystic  Yoga  system, and the process of Krishna Consciousness, or devotional service. Accordingly, in these different processes: 1) by empiric philosophical speculation, the impersonal  Brahman  feature of Krishna is understood; 2) by the process of meditation or  Yoga  mysticism, the feature of the Supersoul, the All-pervading expansion of Krishna, is understood; and 3) by devotional service in full Krishna Consciousness, the Original Personality of Godhead, Krishna is realized.
In this connection Lord Chaitanya quotes first from the  Srimad Bhagwatam , First Canto, Second Chapter, which states that those who are knowers of the Absolute Truth describe the Absolute Truth in three features: some describe the Absolute as impersonal  Brahman , and some describe the Absolute Truth as the localized All-pervading Supersoul, and some know that the Absolute Truth is the Supreme Personality of Godhead, Krishna. In other words,  Brahman , the impersonal manifestation, and  Paramatma , the localized manifestation, and the Supreme Personality of Godhead, are One and the same; but, according to the different processes adopted, He is realized in different features— Brahman ,  Paramatma  and  Bhagavan .
Impersonal  Brahman  realization is simple realization of the effulgence emanating from the transcendental Body of Krishna. We compare this effulgence of the transcendental Body of Krishna to the sunshine: just as the sun disc is there, the sun planet is there, and the Sungod is there, and the sunshine is the shining effulgence of that original Sungod. Similarly,  Brahmajyoti , the spiritual effulgence, impersonal Brahman, is nothing but the Personal effulgence of Krishna.
To support this analysis Lord Chaitanya quotes one important verse from  Brahma Samhita , where Lord Brahma says: “I worship the Supreme Personality of Godhead, Govinda, by Whose Personal effulgence there is the unlimited manifestation of the  Brahmajyoti , and in that  Brahmajyoti  (the impersonal manifestation of Krishna’s Bodily effulgence) there are innumerable Universes, each full of innumerable planets.”
Lord Chaitanya further says that the Paramatma, the All-pervading feature