What does it mean to not have fellowship with the world?

To not have fellowship with the world, as outlined in John 15:19, indicates that believers are called to separate themselves from the values, practices, and ideologies that stand in opposition to Christ and the gospel. This separation does not imply physical withdrawal from society, but rather a refusal to align with or endorse beliefs that contradict Scripture. True fellowship is found in relationships with others who share genuine faith in Christ, rather than with those who reject His sovereignty and grace. By remaining focused on Christ, believers are empowered to share the gospel truthfully and love others by inviting them to turn away from darkness and towards the light of Christ.