What does it mean to have fellowship with Christ in His sufferings?

To have fellowship with Christ in His sufferings means participating in the reality of His pain as well as His victorious power over sin. This fellowship is characterized by an intimate communion where believers identify with Christ's suffering and apply the significance of His crucifixion to their own lives. The text emphasizes that while sin may not be entirely eradicated, its power can be subdued through constant reliance on the cross, allowing believers to share in the transformative work of Christ, enabling them to fight against the indwelling principle of sin effectively.