When did the fullness of God dwell in Christ?

According to Colossians 2:9, the fullness of the Godhead dwelled in Christ at all times—past, present, and future. This truth affirms the eternal nature of Christ’s divinity and His role in creation and salvation. Before the foundation of the world, God's plan included the incarnation and the fullness found in Christ, as suggested in Revelation 13:8, which describes the Lamb slain before the foundation of the world. Therefore, the fullness is not a momentary event but an eternal reality, assuring believers of the unchanging nature of Christ as their source of salvation.