what fellowship has light with darkness

The phrase "what fellowship has light with darkness" is a quote from 2 Corinthians 6:14 in the Bible. The verse is often interpreted as a warning against forming close relationships with people who do not share the same values or beliefs as oneself. The verse suggests that righteousness and unrighteousness, or light and darkness, cannot coexist or have communion with each other. The verse is often used to support the idea of maintaining a separation between believers and non-believers.