In His Gospel , Ramakrishna Paramahamsa described many times the Divine Mother as Kali. Quoting from the Gospel :
"Why is Krishna tribhanga, bent in three places? Because of His love for Radha. That which is Brahman is also Kali, the Adyasakti, who creates, preserves, and destroys the universe. He who is Krishna is the same as Kali. The root is one-all these are His sport and play.
O mind, you do not know how to farm! Fallow lies the field of your life.If you had only worked it well, How rich a harvest you might reap! Hedge it about with Kali's name If you would keep your harvest safe; This is the stoutest hedge of all, For Death himself cannot come near it.
As is a man's meditation, so is his feeling of love; As is a man's feeling of love, so is his gain; And faith is the root of all.If in the Nectar Lake of Mother Kali's feet My mind remains immersed, Of little use are worship, oblations, or sacrifice.
Why should I go to Ganga or Gaya, to Kasi, Kanchi, or Prabhas, So long as I can breathe my last with Kali's name upon my lips?..