According to Byzantine tradition, the discipline of the fast consists of three parts:
Corporal (bodily) fast, by which we give up certain foods, drinks and amusements, in order to break the hold that such things may have over us.
Spiritual or internal fast, by which we seek to turn from any sin, wickedness or evil habits in our lives, so that we may come into God's presence well-prepared to celebrate our Lord's Resurrection and our redemption.
Spiritual renewal, by which we seek a greater practice of the virtues, a deeper life of prayer, repentance for our sins, and a greater conversion (metanoia) of heart, which manifests itself in good works. All of these are oriented to a deeper union with God – theosis.
The Lenten discipline is summarized in the Prayer of Saint Ephrem the Syrian.