That is the promise of the Bhagavata.
The Bhagavata is the story of Krishna, known as Shyam to those who find beauty, wisdom and love in his dark complexion. It is the third great Hindu epic after the Mahabharata and the Ramayana. However, this narration was composed in fragments over thousands of years, first as the Harivamsa, then as the Bhagavata Purana, and finally as the passionate songs of poet-sages in various regional languages.