Easter celebrates Jesus' Resurrection, which confirmed that he was the true son of God and signaled to all who believe in him, that they would be granted eternal life in Heaven, according to Christianity.com. The Resurrection is the cornerstone of the Christian faith.

Archbishop Nelson Perez, of the Archdiocese of Philadelphia, offers a short Holy Week reflection that shed light on some of the mysteries associated with Catholicism.

"Holy Week and the Paschal Triduum are central to understanding the mystery of our faith,” he said in a video posted on Facebook. “I pray that you will spend this time encountering Christ and bearing true witness to the physical and mental anguish he suffered to fulfill God's will.”

The Triduum begins on Holy Thursday and continues through Easter, according to the U.S. Conference of Catholic Bishops (USCCB).

Holy Thursday has a special significance because it is when Jesus instituted the Sacrament of the Eucharist, offering his body and blood to his disciples in the form of bread and wine, the USCCB said. Jesus also instituted the priesthood, entrusting the legacy of the church to his apostles, that evening.

The Gospel reading for Easter Mass this Sunday comes from the book of John, chapter 20, the USCCB said.

The passage recounts the story of Mary Magdalene’s return to the tomb where Jesus had been buried. Upon arriving, she notices that the stone blocking the entrance had been moved. Mary runs to alert two disciples, who returned to the tomb with her. Simon and Peter went inside and found Jesus' burial cloths. The disciples did not yet understand that Jesus had risen from the dead, according to Scripture.

Understanding the anguish Jesus endured is one of the building blocks for a deeper faith, Perez said.

"In doing so, you will come to understand more fully the glory of salvation, attained through his most holy sacrifice and resurrection,” he said in his video. “May God bless you and your loved ones during this Holy Week and always.”