"So far as your question about the disciplic succession, in all Vedic literatures it is mentioned about the disciplic succession. You have read in Srimad-Bhagavatam, first canto, first chapter where it is said that Brahma was inspired from within the heart by the Supreme Personality of Godhead. Similarly, in the Katha Upanisad it is said that 'in order to learn the transcendental science, one has to approach the Spiritual Master.' This spiritual master means one who has heard correctly from his Spiritual Master. In this way, ultimately it goes to Krishna, the Supreme Spiritual Master. There is no possibility of understanding the Vedic knowledge without this descending process. The modern world is puffed up with personal research knowledge, but the person who is engaging in this research work does not know that he is imperfect on account of his aptitude for becoming illusioned, for committing mistakes, for his cheating propensity and for his possessing imperfect senses. Therefore there is no possibility of receiving perfect knowledge without approaching a self-realized Spiritual Master coming down in disciplic succession. The mental speculator, no matter how advanced he may be, cannot deliver us the right knowledge."