 Basil are more penitential, and therefore lend themselves to the Church's liturgical preparation for important holy days; hence, their use during Great Lent and on the eves of Nativity and Theophany (both of which are strict fast days, known as "Paramony").The service may be divided into the Liturgy of the Catechumens and the Liturgy of the Faithful (the following paragraphs describe only those parts which are specific to the Liturgy of St.Basil)