Paschal Triduum

The Paschal Triduum is counted the way the ancient world counted, inclusively and from evening: from the Mass of the Lord's Supper on the evening of Maundy Thursday, through Good Friday and Holy Saturday, to evening prayer on Easter Sunday. Three days, but one observance. The liturgies are deliberately continuous: the Thursday Mass has no dismissal, the Friday liturgy has no true beginning, opening in silence where the previous night left off, and Holy Saturday has almost no liturgy at all, the church keeping still at the tomb until the Vigil breaks the silence in the night.

The earliest Christians did not distribute these commemorations across separate days; they kept a single paschal night that held death and resurrection together, and the Triduum as the Roman books now present it is a deliberate return to that unity, ranked above every other observance of the year so that nothing, not even the greatest saint's day, can displace any part of it. The three days also form the hinge of the whole calendar: Lent ends as the Triduum begins, Eastertide begins as it ends, and every movable feast of the year, from Ash Wednesday to Pentecost, is counted forward or back from the Easter at its centre. The atlas keeps the Triduum as its own entry because the season it crowns cannot be understood with its summit missing.

The centre of the Triduum, and by the church's own account the mother of all vigils, is the Easter Vigil, kept in the night between Holy Saturday and Easter Sunday. Its shape is among the most archaic things in Christian worship. It begins outside, in darkness, with the kindling and blessing of new fire; the paschal candle is lit from it and carried into the unlit church, the light passing candle to candle through the congregation; the deacon then sings the Exsultet, the long proclamation of the night itself. There follows an extended vigil of readings that walks through the whole sweep of scripture, creation, the crossing of the sea, the prophets, before the first Easter alleluia.

The night was from early centuries the preferred moment for baptism, the candidates descending into the water as the church passed from death to life, and the modern rite keeps that inheritance: the font is blessed, catechumens are baptised, and the whole assembly renews its baptismal promises. The vigil's modern prominence is itself a piece of history. By the medieval period it had drifted to Saturday morning, its symbolism of light in darkness inverted; Pius XII restored it to the night in the 1950s, ahead of the wider reforms, and the restored night vigil now stands as the single most solemn liturgy of the Christian year.