The  Srimad Bhagwatam
203
and He said, “My dear sir, I am an ordinary living entity. I cannot know the meaning of  Vedanta Sutra , but Vyasadeva, Who is an incarnation of Narayan, knows the real meaning of the  Vedanta Sutra . No ordinary living being can interpret the  Vedanta Sutra  with his mundane education. In order to curb commentary on  Vedanta Sutra  by unscrupulous persons, the author, Vyasadeva Himself, has already commented on the  Vedanta Sutra  by writing  Srimad Bhagwatam .” In other words, if the author himself explains the purport of his book, that is excellent. Nobody can understand the author’s mind unless the author himself discloses the purport of his language. Therefore  Vedanta Sutra  should be understood by the commentary of the Author Himself, which is  Srimad Bhagwatam .
Pranava or Omkara is the divine substance of all the  Vedas . Omkara is explained further in the  Gayatri Mantra , as exactly explained in the  Srimad Bhagwatam . There are four verses in this connection. These verses are explained to Brahma, and Brahma explained them again to Narada, and Narada explained them to Vyasa. Therefore the purport of the verses in the  Srimad Bhagwatam  comes down in disciplinary succession. It is not that anyone and everyone can make his own commentary on the  Vedanta Sutra  foolishly, and mislead the readers. Anyone who wants to understand  Vedanta Sutra  must read  Srimad Bhagwatam  carefully. Under the instruction of Narada Muni, Vyasadeva compiled  Srimad Bhagwatam  with the purpose of explaining the  Vedanta Sutra  codes.  Vedanta Sutra  was written before  Bhagwatam . After hearing from Narada Muni, Vyasadeva commented on the  Vedanta Sutra . By writing  Srimad Bhagwatam  He collected all the essence of the  Upanishads , the purpose of which was explained also in the  Vedanta Sutra .  Srimad Bhagwatam  is therefore the essence of all Vedic knowledge. That which is stated in the  Upanishads  and stated in the  Vedanta Sutra  is explained very nicely in the  Srimad Bhagwatam .
There is a passage from  Isho Upanishad , similar to one in the  Srimad Bhagwatam , Eighth Canto, First Chapter, the purport of which is that whatever one sees in the cosmic manifestation, everywhere, is the Supreme Lord’s energy, which is non-different from Him. Therefore, He is the Controller of all living entities, and the Friend and Maintainer of everyone. We should live by the mercy of God, and by the things allotted to our particular living condition. Thus one enjoys life, and nobody should encroach on any other’s property.
In other words, the purpose of the  Upanishad  and  Vedanta , and that of  Srimad Bhagwatam , are one and the same. If anyone studies  Srimad Bhagwatam  carefully, he will find that all the  Upanishads  and  Vedanta Sutra  codes are nicely explained