ChapterIV-I. Mysteries of the Lord
204. The office of Sunday begins with evening prayer I, which is taken entirely from the four-week psalter, except those parts that are marked as proper.
205. When a feast of the Lord is celebrated on Sunday, it has a proper evening prayer I.
206. The way to celebrate Sunday vigils, as circumstances suggest, has been discussed in no. 73.
207. It is of great advantage to celebrate, when possible, at least evening prayer with the people, in keeping with a very ancient tradition. 
208. For the Easter triduum the office is celebrated in the way set forth in the Proper of Seasons.
209. Those who take part in the evening Mass of the Lord's Supper or the celebration of the Lord's passion on Good Friday do not say evening prayer on either day.
210. On Good Friday and Holy Saturday the office of readings should be celebrated publicly with the people before morning prayer, as far as this is possible.
211. Night prayer for Holy Saturday is said only by those who are not present at the Easter Vigil.
212. The Easter Vigil takes the place of the office of readings. Those not present at the solemn celebration of the Vigil should therefore read at least four of its readings with the chants and prayers. It is desirable that these be the readings from Exodus, Ezekiel, St. Paul, and from the Gospel. The Te Deum follows, then the prayer of the day.
213. Morning prayer for Easter Sunday is said by all. It is fitting that evening prayer be celebrated in a more solemn way to mark the ending of so holy a day and to commemorate the occasions when the Lord showed himself to his disciples. Great care should be taken to maintain, where it exists, the particular tradition of
celebrating evening prayer on Easter Sunday in honor of baptism. During this there is a procession to the font as the psalms are being sung.
214. The liturgy of the hours takes on a paschal character from the acclamation, Alleluia that concludes most antiphons (see no. 120), from the hymns, antiphons, and special intercessions, and from the proper readings assigned to each hour.
215. On Christmas eve it is fitting that by means of the office of readings, a solemn vigil be celebrated before Mass. Night prayer is not said by those present at this vigil.
216. Morning prayer on Christmas Day is said as a rule before the Mass at Dawn.
Other Solemnities and Feasts of the Lord
217. In arranging the office for solemnities and feasts of the Lord, what is said in nos. 225-233 should be observed, with any necessary changes.