Puranas | पुराण
Just like Vedas Puranas (Devanagari: पुराण ISO15919: purāṇa) are also eternal. They convey the knowledge of the Vedas through stories that highlight universal values, such as non-violence, charity, penance, compassions, and so on.
Puranas have 1 Billion hymns. In Kaliyug people don't have a vast memory or comprehension power. So, just before Kaliyug, Veda Vyas condensed 1 Billion hymns into 400,000 verses and documented them in 18 main Puranas.
Shrimad Bhagavata Mahapuran was the last Purana composed by Sage Ved Vyas and it is the most acclaimed of all Puranas. It is held in such high esteem that it is also called 5th Veda. This Purana rejects all lower goals and advises humans to aim for nishkam bhakti of Shri Krishna.
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REFERENCE
Prema Rasa Madira - The Intoxicating Bliss of Divine Love, Vol. 1 Ch. 3