The church was [Paul’s] joy (1 Thes. 2:19-20) because in their joy in Christ his joy in Christ was greater. More of Christ's mercy was magnified in multiplied converts of the cross. So when Paul chose suffering in the cause of world evangelization and said that his aim was to “gain Christ,” he meant that his own personal enjoyment of fellowship with Christ would be eternally greater because of the great assembly of the redeemed enjoying Christ with him.