Lauds is built on a simple correspondence the whole ancient world understood: sunrise is the natural hour of praise. The service the fourth-century cathedrals sang at dawn was popular and invariable, designed for congregations rather than specialists, and its fixed elements tell its theology. Psalm 63, O God, you are my God, at break of day I seek you, opened the morning's longing; the canticle of the three young men in the furnace called on sun, moon, dew and frost to bless the Lord as the light returned; and the three laudate psalms, 148, 149 and 150, summoned all creation, angels, sea creatures, kings and maidens, trumpet, harp and cymbal, into a crescendo of praise that gave the hour its very name.
At the summit stands the Benedictus, Zechariah's canticle from Luke's Gospel, blessing the God who visits his people, with its dawn image made for the hour: the rising sun shall visit us from on high, to shine on those who sit in darkness. Around these constants the hour gathers a morning hymn, intercessions for the day's work, and the Lord's Prayer. The reform of 1971 named Lauds and Vespers the two hinges of the office and directed that when only part of the office can be prayed, these are the parts to keep, restoring in law what the early church had done in practice: whatever else falls away, the church meets the morning with praise.