Krishna and Kali

"Kali and Krishna are closely related, though at first glance their forms appear divergent and contrary.  Yet their colour is azure and curiously, the bija mantra- klim, the seed syllable of love and desire belongs to Krishna, though it is the actual root sound of the word "Kali".  Similiarly, the bija mantra- Krim, the seed syllable of energy and transformation, belongs to Kali, yet it is the actual root sound of the word "Krishna".... In Bengal and eastern India,  Kali and Krishna are the two main deities worshipped.  While Krishna shows a soft aspect of masculine energy, Kali indicaates the strong aspect of female energy.  If we understand their cosmic play as one we gain power to go beyond duality. Krishna's role like that of Kali was one of death and destruction but for a higher cause.  He manisfested the great Kali shakti, the transformative power of time, which is Kali,"p. 112 Shambavi L. Chopra, Yogic Secrets of the Dark Goddess.