The effect of suffering on a Christian is to strengthen his faith. Suffering is a common experience that Christians face, and it can come in different forms such as persecution, illness, or personal loss. However, through suffering, a Christian's faith can be tested and refined, resulting in a stronger and more mature faith. Suffering also allows a Christian to identify with the sufferings of Christ and serves as an opportunity to display the love and grace of God to others. Therefore, suffering can be a beneficial experience for a Christian, as it helps them grow in their faith and reliance on God.