The most revolutionary aspect of the document was the restoration of the proper times for the liturgical services. The reform mandated that the Solemn Afternoon Liturgy of the Lord’s Passion on Good Friday and the Easter Vigil on Holy Saturday be returned to their original chronological positions—late afternoon and night, respectively. This was not merely a logistical change; it was a theological statement. By celebrating the Easter Vigil at night, the Church restored the powerful symbolism of the Lucernarium , the service of light. The blessing of the new fire and the Paschal Candle regained their full significance as the dispelling of spiritual darkness. This shift allowed the faithful to experience the liturgy not just as a memory of past events, but as a participation in the very rhythm of salvation history.
The Ordo Hebdomadae Sanctae Instauratus (typically abbreviated OHSI ) contains the complete chanted and spoken texts for Palm Sunday, the Sacred Triduum (Maundy Thursday, Good Friday, Holy Saturday/Easter Vigil), and Easter Sunday. The "Instauratus" (restored) version refers to Pius XII's 1955–1956 reform of Holy Week, which was later integrated into the 1962 Missal (used by Traditional Latin Mass communities) and the 1965 interim Missal. ordo hebdomadae sanctae instauratus pdf install