In Slavic folklore, the concept of duality is often represented through the interplay of light and darkness, as well as the existence of good and evil entities. This duality is manifested in characters such as the benevolent goddess Mokosh and the malevolent force, Chernobog. These contrasting forces illustrate the balance required in life and the complexity of human nature. They symbolize how coexistence between opposing qualities is essential for harmony, reflecting the Slavic worldview where both sides contribute to the larger narrative of existence.