The Sunday of Forgiveness is the last Sunday before the start of Great Lent. During the pre-Lenten period, the services of the Church include hymns from the Triodion, a liturgical book that contains the services from the Sunday of the Publican and the Pharisee, the tenth before Pascha (Easter), through Great and Holy Saturday. On the Sunday of Forgiveness focus is placed on the exile of Adam and Eve from the Garden of Eden, an event that shows us how far we have fallen in sin and separated ourselves from God. The beginning of Great Lent is a period of intense fasting, and on this Sunday we are reminded of our need for God’s forgiveness and guidance of our hearts, minds, and spiritual efforts in returning to Him in repentance.
On the evening of the Sunday of Forgiveness, the Church conducts the first service of Great Lent, the Vespers of Forgiveness, a service that directs us further on the path of repentance and helps us to acknowledge our need for forgiveness from God and to seek forgiveness from our brothers and sisters in Christ. This is the first time that the Lenten prayer of St. Ephraim accompanied by prostrations is read. At the end of the service all the faithful approach the priest and one another asking for mutual forgiveness.
Orthodox Christians are encouraged to enter Great Lent in repentance and confession by attending these services, coming for the Sacrament of Confession, and dedicating themselves to worship, prayer, and fasting throughout the Lenten period. The first day of Lent, Clean Monday, signifies the beginning of a period of cleansing and purification of sins through repentance.