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Teachings of Lord Chaitanya
the life and activities of Krishna are described because Krishna is the Shelter of all other manifestations. Therefore Sukadeva Goswami worshipped and offered his obeisances unto Krishna, the Shelter of everything.
This purport maintains that in this world there are two different principles: the one principle is the origin, or the shelter of everything, and the other principle is the deduction from the original principle. The Supreme Truth is the shelter of all manifestations. That Supreme Truth is called  Asraya . All other principles, which remain under the control of the  Asraya-tattwa , or the Absolute Truth, are called  Asrita , or subordinate corollaries and reactions. The purpose of the material manifestation is to give the conditioned soul a chance to become liberated and return to the  Asraya-tattwa , or the Absolute Truth.
So everything that is in the cosmic Creation is dependent on the  Asraya-tattwa , the Supreme Absolute Truth. As such, the creative manifestation, or Vishnu manifestation, the different types of demigods and manifestations of energy, the living entities, the material elements—everything is dependent on Krishna, the Supreme Truth.  Srimad Bhagwatam  indicates that everything, directly and indirectly, has Krishna as the Supreme Shelter. Therefore the analytical study of Krishna is the perfect knowledge, as is confirmed in the  Bhagavad Gita .
Lord Chaitanya described the different features of Lord Krishna in the following manner, and asked Sanatan Goswami to hear attentively: He said that Krishna originally is the Son of Nanda Maharaj, and He is the Absolute Supreme Truth. He is the Cause of all causes, and He is the Origin of all emanations and all incarnations, yet there in Vraja or Goloka Vrindaban He is just like a young boy. His Form is eternal, full of bliss and full of knowledge absolute. He is the Shelter of everything, and He is the Proprietor or Master of everything.
In this connection Lord Chaitanya gives evidence from  Brahma Samhita , Fifth Chapter, 1st verse, which states that Krishna is the Supreme Personality of Godhead and His Body is full of knowledge, eternal and blissful. He is the Original Person, known as Govinda, and He is the Cause of all causes. Therefore, Krishna is the Original Personality of Godhead; He is full of all six opulences, and His Abode is known as Goloka Vrindaban, the highest planetary system in the Spiritual Sky.
Lord Chaitanya also quotes a verse from the  Srimad Bhagwatam , First Canto, Third Chapter, in which it is stated clearly that all the incarnations described in that particular verse are either direct expansions of Krishna, or