Krishna Leela - Kamsa

When Kamsa was about to kill Devaki's child, she slips from his hand and appears as Kali: "O' foolish one, what would you gain by killing me?! The one who will kill you is already born in some other place. Don't kill other children in vain".
This prophecy haunts kamsa. He fears Krishna. He thinks about Krishna all the time and sees krishna in everything. The prophecy of Yogamaya turns out to be a blessing for Kamsa.