How are Christians called into fellowship with God?

Christians are called into fellowship with God by the gracious act of God, as articulated in 1 Corinthians 1:9. This calling is distinct because it is entirely sovereign; God does not require a person's prior acceptance or worthiness. Instead, He selects sinners to come into fellowship with Him through Jesus Christ. The Holy Spirit plays an essential role by conveying this divine notification to sinners, declaring their sinfulness while simultaneously revealing God’s love and provision for redemption. This interplay highlights the depth of God’s grace and mercy in forming this fellowship.