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Read the Catechism in a Year

Catechism in a Year: Day 156

Part Two: How We Celebrate the Christian Mysteries
- Section One: God Acts in Our Regard by Means of Sacred Signs
-- Chapter One: God and the Sacred Liturgy
Question 171: What is the essence of every liturgy?
Liturgy is always in the first place communion or fellowship with Jesus Christ. Every liturgy, not just the celebration of the Eucharist, is an Easter in miniature. Jesus reveals his passage from death to life and celebrates it with us. [1085]
The most important liturgy in the world was the Paschal liturgy that Jesus celebrated with his disciples in the Upper Room on the night before his death. The disciples thought that Jesus would be commemorating the liberation of Israel from Egypt. Instead, Jesus celebrated the liberation of all mankind from the power of death. Back in Egypt it was the “blood of the lamb” that preserved the Israelites from the angel of death. Now he himself would be the Lamb whose blood saves mankind from death. For Jesus’ death and Resurrection is the proof that someone can die and nevertheless gain life. This is the genuine substance of every Christian liturgy. Jesus himself compared his death and Resurrection with Israel’s liberation from slavery in Egypt. Therefore, the redemptive effect of Jesus’ death and Resurrection is called the Paschal mystery. There is an analogy between the life-saving blood of the lamb at the Exodus of the Israelites from Egypt (Ex 12) and Jesus, the true Paschal Lamb that has redeemed mankind from the bondage of death and sin.
Dig Deeper: Corresponding CCC section (1085) and other references here.
Recommended Listening: Understanding the Eucharist by Dr. Scott Hahn