“Brahman and Śakti are identical. If you accept the one, you must accept the other. It is like fire and its power to burn. If you see the fire, you must recognize its power to burn also. You cannot think of fire without its power to burn, nor can you think of the power to burn without fire. You cannot conceive of the sun’s rays without the sun, nor can you conceive of the sun without its rays. You cannot think of the milk without the whiteness, and again, you cannot think of the whiteness without the milk. Thus one cannot think of Brahman without Śakti, or of Śakti without Brahman. One cannot think of the Absolute without the Relative, or of the Relative without the Absolute.”
Ramakrishna, in The Gospel of Sri Ramakrishna (1942)

In the Kaliyuga, man, being totally dependent on food for life, cannot altogether shake off the idea that he is the body. In this state of mind it is not proper for him to say: “I am He”. When a man does all sorts of worldly things, he should not say, “I am Brahman”. Those who cannot give up attachment to worldly things, and who find no means to shake off the feeling of “I”, should rather cherish the idea, “I am God’s servant; I am His devotee.”