The saints, he said, "bring about change through meekness of heart. With that meekness, we come to understand the grandeur of God and worship him with sincere hearts."
He said the Beatitudes "are in some sense the Christian's identity card," because they identify us as followers of Jesus.
"We are called to be blessed, to be followers of Jesus, to confront the troubles and anxieties of our age with the spirit and love of Jesus. Thus we ought to be able to recognize and respond to new situations with fresh spiritual energy."
Francis closed his homily saying that the saints "spur us on by their lives and their intercession before God," and stressed that each of us needs one another if we are also to become saints.
"Together let us implore the grace to accept this call with joy and to join in bringing it to fulfillment," he said, and entrusted to Mary, Queen of All Saints, "our intentions and the dialogue aimed at the full communion of all Christians, so that we may be blessed in our efforts and may attain holiness in unity."
After Mass Pope Francis was greeted by Bishop Anders Arborelius, OCD of Stockholm before leading pilgrims in praying the Angelus.
In his brief address before the prayer, the Pope thanked all who helped to organize and plan his visit, specifically the Lutheran World Federation and greeted the different ecumenical delegations present.
"I thank God that I was able to visit this land and to meet with you, many of whom have come from all over the world," he said, explaining that as Catholics, "we are part of a great family and are sustained in the same communion."
He encouraged them to live their faith in prayer and the sacraments, as well as in service to those who are suffering and needy.
"I urge you to be salt and light, wherever you find yourselves, through the way you live and act as followers of Jesus, and to show great respect and solidarity with our brothers and sisters of other churches and Christian communities, and with all people of good will," he said.
Pope Francis then turned to Mary and asked for her protection. He also asked Mass attendees to pray for him, saying, "I keep you all very present in my own."
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Elise Harris was senior Rome correspondent for CNA from 2012 to 2018.