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In page Great Lent:

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Besides the additional liturgical celebrations described below, Christians are expected to pay closer attention to and increase their private prayer.[citation needed] According to Byzantine Rite theology, when asceticism is increased, prayer must be increased also. The Church Fathers have referred to fasting without prayer as "the fast of the demons"[citation needed] since the demons do not eat according to their incorporeal nature, but neither do they pray.