The Parish Priest of Sacred Heart Tonj in the Catholic Diocese of Rumbek appeals to faithful to be brighter inside their hearts.
Fr Paul Antimi says many people appear shining outside, but darker inside their hearts, Radio Don Bosco reports.
The priest asks Christians to follow the footsteps of Jesus who lived in both light and darkness during transfiguration and crucifixion.
Fr Antimi urges all believers to use their power to protect the weak people, not to destroy them.
The priest was preaching on Sunday during the feast of transfiguration in Tonj.