The vestments and linens of the church during Lent, are characterized by a very dark purple to demonstrate the penitential nature of the season, with a focus on the need for corporate and personal spiritual renewal as a people. The Lenten season begins with Ash Wednesday and continues for forty days, excluding Sundays. (Sundays are excluded because they are celebration days – The Lord’s Day of Resurrection; and since Lent is a penitential season, Sundays are therefore not included in the forty days counted for Lent.) The period of forty days draws its significance from the Jewish Passover and from Jesus’ forty days of fasting and prayer in the wilderness.
Segler F., Bradley R.(2006); Christian Worship, its Theology and Practice