The spiritual works of mercy are charitable actions by which people come to the aid of neighbors in the spiritual need. The spiritual works of mercy seek to alleviate human misery, a sign of human frailty and need for salvation as a consequence of original sin. Everyone is obliged to perform the spiritual works of mercy, according to one's ability and the need of one's neighbor.
Ordinary deeds done every day to relieve the spiritual needs of others are true works of mercy, when done in the name of Christ.
adapted from the Catechism of the Catholic Church (#2443-2449)
The light shines in the darkness, and the darkness has not overcome it.