These rules exist not as a Pharisaic law, "burdens grievous to be borne" Luke 11:46, but as an ideal to be striven for; not as an end in themselves, but as a means to the purification of heart, the enlightening of mind, the liberation of soul and body from sin, and the spiritual perfection crowned in the virtue of love towards God and man.
The emphasis towards this period differs somewhat from Western Christianity- the Eastern focus is less on repentance and more of an attempt to recapture humanity's original state.
Observance of Great Lent is characterized by fasting and abstinence from certain foods, intensified private and public prayer, self-examination, confession, personal improvement, repentance and restitution for sins committed, and almsgiving.
On the weekdays of Great Lent, the full Divine Liturgy is not celebrated, because the joy of the Eucharist (literally "Thanksgiving") is contrary to the attitude of repentance which predominates on these days.
This service starts with Vespers during which a portion of the Body and Blood of Christ, which was reserved the previous Sunday, is brought to the prothesis table.
When the feast day of the patron saint of the parish church or monastery falls on a weekday of Great Lent, there is no liturgy (other than the Presanctified), but fish is allowed at the meal.
When some other important feast occurs on a weekday, such as the First and Second Finding of the Head of John the Baptist (February 24), the Forty Martyrs of Sebaste (March 9), etc., it is usually combined with the Lenten service, and wine and oil are allowed at the meal.
On the Saturdays, Sundays, and a number of weekdays during Great Lent, the service materials from the Triodion leave no room for the commemoration of the Saint of the day from the Menaion.
In order that their services not be completely forgotten, a portion of them (their canon at Matins, and their stichera from "Lord I Have Cried" at Vespers) is chanted at Compline.
In the Byzantine ("Greek") liturgical traditions, the Gospel reading for Zacchaeus remains in the normal lectionary cycle and does not always fall on the fifth Sunday before Lent.
During Forgiveness Vespers (on Sunday evening) the hangings and vestments in the church are changed to somber Lenten colours to reflect a penitential mood.
The name "Clean Week" refers to the spiritual cleansing each of the faithful is encouraged to undergo through fasting, prayer, repentance, reception of the Holy Mysteries and begging forgiveness of his neighbor.
At the end of the Presanctified Liturgy on Friday (since, liturgically, the day begins at sunset) a special canon to St. Theodore, composed by St. John of Damascus, is chanted.
Then the priest blesses kolyva (boiled wheat with honey and raisins) which is distributed to the faithful in commemoration of the following miracle worked by St. Theodore on the First Saturday of Great Lent.
Fifty years after the death of St Theodore, the emperor Julian the Apostate (361-363), as a part of his general policy of persecution of Christians, commanded the governor of Constantinople during the first week of Great Lent to sprinkle all the food provisions in the marketplaces with the blood offered to pagan idols, knowing that the people would be hungry after the strict fasting of the first week.
St Theodore appeared in a dream to Archbishop Eudoxius, ordering him to inform all the Christians that no one should buy anything at the marketplaces, but rather to eat cooked wheat with honey (kolyva).
The Liturgy's Prokeimenon and alleluia verses as well as the Epistle (Hebrews 11:24-26,32-40) and Gospel (John 1:43–51) readings appointed for the day continue to reflect this older usage.
On Monday and Wednesday of the Fourth Week, a Veneration of the Cross takes place at the First Hour (repeating a portion of the service from the All-Night Vigil of the previous Sunday).
The Sunday which ends the fourth week is dedicated to St. John Climacus, whose work, The Ladder of Divine Ascent has been read throughout the Great Lenten Fast.
This is the longest Canon of the church year, and during the course of its nine Odes, most every person mentioned in the Bible is called to mind and tied to the theme of repentance.
While the Great Canon itself is recited during Matins for Thursday, this service is usually celebrated by anticipation on the prior Wednesday evening, so that more people can attend.
As a part of the Matins of the Great Canon, the Life of St. Mary of Egypt by St. Sophronius, Patriarch of Jerusalem (634 - 638) is read, for her example of repentance and overcoming temptation.
The next day (Thursday morning) a special Presanctified Liturgy is celebrated, and the fast is relaxed slightly (wine and oil are allowed) as consolation after the long service the night before.
The hangings in the church and the vestments of the clergy are changed from dark Lenten hues to more festive colours (red, in the Russian tradition).
The Matins service, usually celebrated Thursday night, is officially entitled, "The Office of the Holy and Redeeming Passion of our Lord Jesus Christ".
Before the Sixth Gospel (Mark 15:16–32) which first mentions the Crucifixion, the priest carries a large cross into the center of the church, where it is set upright and all the faithful come forward to venerate it.
At the point during the reading which mentions Joseph of Arimathea and Nicodemus, two clergymen approach the large cross in the center of the church, remove the soma, wrap it in a piece of white linen, and carry it into the sanctuary.
Later, during the Troparion, the clergy carry the epitaphios (a cloth icon symbolizing the winding sheet in which Jesus was prepared for burial) into the center of the church, where it is venerated by all the faithful.
Thus, according to Byzantine Rite theology, Jesus' salvific work on the Cross has been accomplished, and the righteous departed in the Bosom of Abraham have been released from their bondage; however, the Good News of the Resurrection has not yet been proclaimed to the living on earth, the celebration of which commences at midnight with Matins.
After the concluding prayers and a dismissal, all of the lights and candles in the church are extinguished, and all wait in silence and darkness for the stroke of midnight, following which the Pentecostarion replaces the Lenten Triodion, commencing with the resurrection of Christ being proclaimed.