Your second question about falling down from the brahmajyoti is answered that it is not that one must fall down, but that they generally fall down. There is a verse in Srimad-Bhagavatam, 10th canto, 2nd chapter, verse 26, which says: "My Dear Lotus Eyed Personality of Godhead, persons who are very proud of becoming one with the brahma effulgence and thereby consider that they have become liberated are factually in a contaminated consciousness on account of the absence of devotional service unto You. Such persons may rise to a high level of spiritual understanding as far as the impersonal brahmajyoti but on account of the lack of devotional service unto You, they generally fall down again into material contamination.''
Letter to Harer Nama, 21 December, 1968