The Church Year, 2025

Paschal Triduum: Sundown on Holy Thursday to sundown on Easter Sunday is considered the most solemn part of the liturgical year. This three-day period is referred to as the Easter Triduum, also known as the Sacred Triduum, or Paschal Triduum. The word "triduum" comes from the Latin word triduum, which comes from tris (“three”) + dies (“day”).

Basically, the Sacred Triduum is one great festival recounting the last three days of Jesus' life on earth, the events of his Passion and Resurrection, when the Lamb of God laid down his life in atonement for our sins. "Though chronologically three days, they are liturgically one day unfolding for us the unity of Christ's Paschal Mystery" (USCCB).

It is known as the "Paschal Mystery" because it is the ultimate fulfillment of the ancient Jewish Passover (or Pasch), which itself was a recollection of how God brought the Jews out of their slavery in Egypt. The spotless lamb was slaughtered at the Passover meal and consumed—that same night the destroying angel "passed over" the homes marked with the blood of the Passover Lamb, and those covered by the Blood were saved. This was the Old Testament prefigurement of Jesus' work at the Last Supper—where he inserted himself as the Paschal Lamb—and Calvary, where the sacrifice was offered to save us from our slavery to sin. With the Holy Eucharist, we consume the victim that died for our sins.

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​The Paschal Mystery is, therefore, God's plan of redemption for the fallen human race through the passion, death, and resurrection of the God-man Jesus Christ. It is one marvelous event stretched out over three days.

[Ref. catholiccompany.com]