"He was led like a lamb to the slaughter; he was oppressed, yet he did not open his mouth" (Is 53:7)
The liturgy of the Triduum opens and closes in silence. In the Mass in Coena Domini (Holy Thursday), after the communion rites, the assembly is not dismissed, but is invited to pause in silence and adoration; the liturgy of Passion Friday begins with the solemn silent precession and prostration; this liturgy also knows no dismissal, but is prolonged in the adoration of the Cross throughout the day of Holy Saturday. 
Finally, Holy Saturday is the day of the "great silence", an a-liturgical day, that is, without celebrations awaiting the great and solemn Easter Vigil on the Holy Night. 
From the last tolling of the bells of the Mass of the Lord's Supper until the crackling of the fire in the Holy Vigil, everything falls silent.
Silence therefore opens the time of the Passion to the point of opening it with a cry: "Light of Christ" in the solemn Easter vigil. 
From silence springs the new song, a cry of joy that tears apart the darkness of sin and death and announces a great joy: Christ is truly risen. Alleluia! 
Silence therefore, like a great inclusion, opens and closes, knotting together, the entire liturgy of the Easter Triduum.