Purusha and Prakriti

"He who is Brahman is the Ādyāśakti, the Primal Energy. When inactive He is called Brahman, the Purusha; He is called Śakti, or Prakriti, when engaged in creation, preservation, and destruction. These are the two aspects of Reality: Purusha and Prakriti. He who is the Purusha is also Prakriti. Both are the embodiment of Bliss. 

"If you are aware of the Male Principle, you cannot ignore the Female Principle: He who is aware of the father must also think of the mother. (Keshab laughs ) 

He who knows darkness also knows light. He who knows night also knows day. He who knows happiness also knows misery. You understand this, don't you?" 

KESHAB: "Yes, sir.  I do." 

- Gospel of Sri Ramakrishna, P 321 (28 November 1883)