VATICAN CITY (CNA/EWTN News) - Pope Francis reminded Christians on Easter Sunday that the Resurrection is the cornerstone of our faith - and that even in the face of unexplainable tragedy and suffering in the world, we can declare, "Christ is risen!"

"This is not a fantasy. The Resurrection of Christ is not a party with many flowers," he said during Easter Mass in St. Peter's Square. "This is beautiful, but it is not this, it is more; It is the mystery of the rejected stone that ends up being the foundation of our existence."

"This throwaway culture," he said, where we use something and then throw it away, "where what is not needed is rejected, the stone - Jesus - is discarded" but then becomes the source of eternal life.

The world has many misfortunes, such as disease, human trafficking, wars, destruction, revenge and hatred. We may be tempted to ask, "But where is the Lord?" he said. "Today, the Church continues to say: 'Stop, Jesus is risen.'"

The Pope said that before God, we can each say: "I do not know how this goes, but I'm sure that Christ is risen, and I'd bet on that."

"Brothers and sisters, this is what I wanted to tell you. Go home now, repeating in your heart: 'Christ is risen,'" he concluded.

Following Mass, Pope Francis gave the traditional "Urbi et Orbi" blessing from the balcony of St. Peter's Basilica. 

He said how through his death and Resurrection, Christ the Shepherd has come to save his people - those "lost sheep" who through sin have wandered onto the wrong path and away from him.

"All of us, when we let ourselves be mastered by sin, lose the right way and end up straying like lost sheep. But God himself, our shepherd, has come in search of us. To save us, he lowered himself even to accepting death on the cross," he said.

In his prayer, the Pope listed by name some of the current conflict zones around the world, especially the Middle East, Africa, South America and Ukraine, and called for peace in those regions of ongoing violence.

In particular, he named an attack which took place on the outskirts of Aleppo in Syria April 15. A bomb blast on a crowded Syrian bus convoy killed at least 112 people, the Syrian Observatory for Human Rights monitoring group said April 16.

"In these times, especially support the efforts of those who work actively to bring relief and comfort to the civilian population in Syria, the victims of a war that continues to sow horror and death."

"Just yesterday the last despicable attack on fleeing refugees which resulted in numerous deaths and injuries," he prayed.

The Pope also prayed for all those caught in forms of slavery and for all those forced to leave their home because of conflict, terrorism, famine or oppressive regimes.

"In every age, the Risen Shepherd tirelessly seeks us, his brothers and sisters, wandering in the deserts of this world. With the marks of the passion - the wounds of his merciful love - he draws us to follow him on his way, the way of life," he said.

Please see below for the full text of the Pope's "Urbi et Orbi" message:

Dear Brothers and Sisters,
Happy Easter!

Today, throughout the world, the Church echoes once more the astonishing message of the first disciples: "Jesus is risen!" - "He is truly risen, as he said!"

The ancient feast of Passover, the commemoration of the liberation of the Hebrew people from slavery, here finds fulfilment. By his resurrection, Jesus Christ has set us free from the slavery of sin and death, and has opened before us the way to eternal life.

All of us, when we let ourselves be mastered by sin, lose the right way and end up straying like lost sheep. But God himself, our shepherd, has come in search of us. To save us, he lowered himself even to accepting death on the cross. Today we can proclaim: "The Good Shepherd has risen, who laid down his life for his sheep, and willingly died for his flock, alleluia" (Roman Missal, IV Sunday of Easter, Communion antiphon). 

In every age, the Risen Shepherd tirelessly seeks us, his brothers and sisters, wandering in the deserts of this world. With the marks of the passion - the wounds of his merciful love - he draws us to follow him on his way, the way of life. Today too, he places upon his shoulders so many of our brothers and sisters crushed by evil in all its varied forms.

The Risen Shepherd goes in search of all those lost in the labyrinths of loneliness and marginalization. He comes to meet them through our brothers and sisters who treat them with respect and kindness, and help them to hear his voice, an unforgettable voice, a voice calling them back to friendship with God.

He takes upon himself all those victimized by old and new forms of slavery, inhuman labor, illegal trafficking, exploitation and discrimination, and grave forms of addiction. He takes upon himself children and adolescents deprived of their carefree innocence and exploited, and those deeply hurt by acts of violence that take place within the walls of their own home.

The Risen Shepherd walks beside all those forced to leave their homelands as a result of armed conflicts, terrorist attacks, famine and oppressive regimes. Everywhere he helps these forced migrants to encounter brothers and sisters, with whom they can share bread and hope on their journey.

In the complex and often dramatic situations of today's world, may the Risen Lord guide the steps of all those who work for justice and peace. May he grant the leaders of nations the courage they need to prevent the spread of conflicts and to put a halt to the arms trade.

Especially in these days, may he sustain the efforts of all those actively engaged in bringing comfort and relief to the civil population in Syria, prey to a war that continues to sow horror and death. Just yesterday the last despicable attack on fleeing refugees which resulted in numerous deaths and injuries. May he grant peace to the entire Middle East, beginning with the Holy Land, as well as in Iraq and Yemen.

May the Good Shepherd remain close to the people of South Sudan, Sudan, Somalia and the Democratic Republic of Congo, who endure continuing hostilities, aggravated by the grave famine affecting certain parts of Africa.

May the Risen Jesus sustain the efforts of all those who, especially in Latin America, are committed to ensuring the common good of societies marked at times by political and social tensions that in some cases have resulted in violence. May it be possible for bridges of dialogue to be built, by continuing to fight the scourge of corruption and to seek viable and peaceful solutions to disputes, for progress and the strengthening of democratic institutions in complete respect for the rule of law.

May the Good Shepherd come to the aid of Ukraine, still beset by conflict and bloodshed, to regain social harmony. May he accompany every effort to alleviate the tragic sufferings of those affected by the conflict.

The Risen Lord continues to shed his blessing upon the continent of Europe. May he grant hope to those experiencing moments of crisis and difficulty, especially due to high unemployment, particularly among young people.

Dear brothers and sisters, this year Christians of every confession celebrate Easter together. With one voice, in every part of the world, we proclaim the great message: "The Lord is truly risen, as he said!" May Jesus, who vanquished the darkness of sin and death, grant peace to our days. Happy Easter!