The Psalter is the only part of scripture that Christians pray rather than read about, and it has structured the Christian day for sixteen centuries. Benedict's Rule distributes all 150 across a week; the Byzantine kathisma cycle covers them weekly and twice weekly in Lent; the Coptic Agpeya assigns fixed psalms to seven hours of the day; the Ethiopian Dawit is chanted from memory. Cranmer's Book of Common Prayer put a monthly cycle in the hands of English laypeople in 1549, which is why the Coverdale psalter is the English most people quote without knowing it. The awkward part is the imprecatory psalms — the ones asking God to break teeth, and Psalm 137, which ends by pronouncing happy the one who smashes Babylonian infants against a rock. Most modern lectionaries omit those verses, and the omission is itself a decision that a fair number of Christians, particularly those who pray from places of real violence, argue against.