The Rev. Thomas Rosica is CEO of Canada's Salt and Light Catholic Media Foundation and English-language media attache to the Holy See Press Office.

(CNN) Pope Francis seems to be obsessed with the devil.

His tweets and homilies about the devil, Satan, the Accuser, the Evil One, the Father of Lies, the Ancient Serpent, the Tempter, the Seducer, the Great Dragon, the Enemy and just plain "demon" are now legion.

For Francis, the devil is not a myth, but a real person. Many modern people may greet the Pope's insistence on the devil with a dismissive, cultural affectation, indifference, or at the most indulgent curiosity.

Yet Francis refers to the devil continually. He does not believe him to be a myth, but a real person, the most insidious enemy of the church. Several of my theologian colleagues have said that he has gone a bit overboard with the devil and hell! We may be tempted to ask, why in the devil is Pope Francis so involved with the prince of demons?

This intelligent Jesuit Pope is diving into deep theological waters, places where very few modern Catholic clerics wish to tread.

Francis' seeming preoccupation with the devil is not a theological or eschatological question as much as a call to arms, an invitation to immediate action, offering very concrete steps to do combat with the devil and the reign of evil in the world today.

In his homilies, Francis warns people strongly to avoid discouragement, to seize hope, to move on with courage and not to fall prey to negativity or cynicism.

Photos: Pope Francis Colombian President Juan Manuel Santos, left, reads aloud words engraved on a pen as he meets with Pope Francis at the Vatican, Friday, December 16, 2016. The words "The bullets have written our past, education will write our future" are engraved on the pen, made from a recycled bullet once used in the civil war between the Colombian government and the Revolutionary Armed Forces of Colombia (FARC). The pen was later used to sign the peace agreements between the parties earlier this year. Santos, who was awarded the 2016 Nobel Peace Prize for his efforts to end the region's longest-running conflict, presented Pope Francis with the pen. Hide Caption 1 of 44 Photos: Pope Francis Pope Francis accepts a letter from a child he visited at a pediatric hospital in Rome on Thursday, December 15, 2016. Hide Caption 2 of 44 Photos: Pope Francis Pope Francis poses with members of the International Catholic Rural Association at the Vatican on Saturday, December 10, 2016. Hide Caption 3 of 44 Photos: Pope Francis Pope Francis salutes the faithful upon his arrival in St. Peter's Square at the Vatican for the Special Jubilee Papal Audience on Saturday, October 22, 2016. Hide Caption 4 of 44 Photos: Pope Francis Pope Francis looks on with joy as he releases a dove as a symbol of peace during a meeting with the Assyrian Chaldean community at the Catholic Chaldean Church of St. Simon Bar Sabbae in Tbilisi, Georgia, on September 30, 2016. Hide Caption 5 of 44 Photos: Pope Francis Pope Francis passes the main entrance to Auschwitz-Birkenau, the former concentration camp in Poland, on Friday, July 29, 2016. The Pope was there to pay tribute to those who died in the Holocaust. Hide Caption 6 of 44 Photos: Pope Francis Pope Francis looks on as Catholicos of All Armenians Karekin II celebrates the Divine Liturgy at the Apostolic Cathedral in Etchmiadzin, outside Yerevan, Armenia, on June 26, 2016. Hide Caption 7 of 44 Photos: Pope Francis Pope Francis arrives to celebrate an extraordinary Jubilee Audience as part of ongoing celebrations of the Holy Year of Mercy in St. Peter's Square in Vatican City on May 14, 2016. Hide Caption 8 of 44 Photos: Pope Francis Pope Francis hugs a child at the Moria refugee camp on the Greek island of Lesbos on Saturday, April 16, 2016. Pope Francis received an emotional welcome on the island during a visit showing solidarity with migrants fleeing war and poverty. Hide Caption 9 of 44 Photos: Pope Francis Pope Francis confesses in St. Peter's Basilica during the Vatican's Penitential Celebration on Friday, March 4, 2016. Hide Caption 10 of 44 Photos: Pope Francis Pope Francis tries on a traditional sombrero he received as a gift from a Mexican journalist on Friday, February 12, 2016, aboard a flight from Rome to Havana, Cuba. The voyage kicked off his weeklong trip to Mexico. With his penchant for crowd-pleasing and spontaneous acts of compassion, Pope Francis has earned high praise from fellow Catholics and others since he succeeded Pope Benedict XVI in March 2013. Hide Caption 11 of 44 Photos: Pope Francis Pope Francis arrives for his visit with prisoners in Santa Cruz, Bolivia, on Friday, July 10, 2015. The Pope emphasized the plight of the poor during his eight-day tour of South America, which also included stops in Ecuador and Paraguay. Hide Caption 12 of 44 Photos: Pope Francis Bolivian President Evo Morales presents the Pope with a gift of a crucifix carved into a wooden hammer and sickle -- the Communist symbol uniting laborers and peasants -- in La Paz, Bolivia, on Wednesday, July 8, 2015. Hide Caption 13 of 44 Photos: Pope Francis Pope Francis greets a crowd of Italian Catholic boy scouts and girl guides at St. Peter's Square on Saturday, June 13, 2015. Hide Caption 14 of 44 Photos: Pope Francis Russian President Vladimir Putin, left, meets Pope Francis at the Vatican on Wednesday, June 10, 2015. The Pope gave Putin a medallion depicting the angel of peace, Vatican spokesman Federico Lombardi said. The Vatican called it "an invitation to build a world of solidarity and peace founded on justice." Lombardi said the pontiff and President talked for 50 minutes about the crisis in Ukraine and violence in Iraq and Syria. Hide Caption 15 of 44 Photos: Pope Francis Pope Francis meets with Cuban President Raul Castro at the Vatican on Sunday, May 10, 2015. Castro thanked the Pope for his role in brokering the rapprochement between Havana and Washington. Hide Caption 16 of 44 Photos: Pope Francis The Pope prays face down on the floor of St. Peter's Basilica during Good Friday celebrations at the Vatican on Friday, April 3, 2015. Hide Caption 17 of 44 Photos: Pope Francis Pope Francis touches a child's face as he arrives for a meeting at the Vatican on Friday, March 6, 2015. Hide Caption 18 of 44 Photos: Pope Francis Hindu priest Kurukkal SivaSri T. Mahadeva presents a shawl to Pope Francis in Colombo, Sri Lanka, on Tuesday, January 13, 2015. Hide Caption 19 of 44 Photos: Pope Francis The Pope attends Christmas Eve Mass at St. Peter's Basilica in Vatican City in December 2014. Hide Caption 20 of 44 Photos: Pope Francis Pope Francis and Ecumenical Patriarch Bartholomew I address the faithful in Istanbul on Sunday, November 30, 2014. Hide Caption 21 of 44 Photos: Pope Francis Pope Francis speaks during the feast-day Mass while on a one-day trip to Italy's Calabria region in June 2014. The Pope spoke out against the Mafia's "adoration of evil and contempt for the common good," and declared that "Mafiosi are excommunicated, not in communion with God." Hide Caption 22 of 44 Photos: Pope Francis Pope Francis prays next to a rabbi at the Western Wall in Jerusalem's Old City in May 2014. The Pope went on a three-day trip to the Holy Land , and he was accompanied by Jewish and Muslim leaders from his home country of Argentina. Hide Caption 23 of 44 Photos: Pope Francis The Pope meets the faithful as he visits the Roman Parish of San Gregorio Magno in April 2014. Hide Caption 24 of 44 Photos: Pope Francis Queen Elizabeth II and Prince Philip, Duke of Edinburgh, have an audience with the Pope during their one-day visit to Rome in April 2014. Hide Caption 25 of 44 Photos: Pope Francis Francis speaks with US President Barack Obama at the Vatican in March 2014. Hide Caption 26 of 44 Photos: Pope Francis The Pope blesses the altar at Rome's Basilica of Santa Sabina as he celebrates Mass on Ash Wednesday in March 2014. Hide Caption 27 of 44 Photos: Pope Francis Daniele De Sanctis, a 19-month-old dressed as the pope, is handed to Francis as the pontiff is driven through the crowd in St. Peter's Square in February 2014. Hide Caption 28 of 44 Photos: Pope Francis Wind blows the papal skullcap off Pope Francis' head in February 2014. Hide Caption 29 of 44 Photos: Pope Francis A lamb is placed around Francis' neck in January 2014 as he visits a living nativity scene staged at a church on the outskirts of Rome. Hide Caption 30 of 44 Photos: Pope Francis Pope Francis meets with Pope Emeritus Benedict XVI at the Vatican in December 2013. Benedict surprised the world by resigning "because of advanced age." It was the first time a pope has stepped down in nearly 600 years. Hide Caption 31 of 44 Photos: Pope Francis Pope Francis marked his 77th birthday in December 2013 by hosting homeless men at a Mass and a meal at the Vatican. One of the men brought his dog. Hide Caption 32 of 44 Photos: Pope Francis Pope Francis embraced Vinicio Riva, a disfigured man who suffers from a non-infectious genetic disease, during a public audience at the Vatican in November 2013. Riva then buried his head in the Pope's chest. Hide Caption 33 of 44 Photos: Pope Francis Pope Francis jokes in November 2013 with members of the Rainbow Association Marco Iagulli Onlus, which uses clown therapy in hospitals, nursing homes and orphanages. Hide Caption 34 of 44 Photos: Pope Francis A young boy hugs Francis as he delivers a speech in St. Peter's Square in October 2013. The boy, part of a group of children sitting around the stage, played around the Pope as the Pope continued his speech and occasionally patted the boy's head. Hide Caption 35 of 44 Photos: Pope Francis Francis has eschewed fancy cars. Here, Father Don Renzo Zocca, second from right, offers his white Renault 4L to the Pope during a meeting at the Vatican in September 2013. Hide Caption 36 of 44 Photos: Pope Francis Francis has his picture taken inside St. Peter's Basilica with youths who came to Rome for a pilgrimage in August 2013. Hide Caption 37 of 44 Photos: Pope Francis During an impromptu news conference in July 2013, while on a plane from Brazil to Rome, the Pope said about gay priests, "Who am I to judge?" Many saw the move as the opening of a more tolerant era in the Catholic Church. Hide Caption 38 of 44 Photos: Pope Francis Crowds swarm the Pope as he makes his way through World Youth Day in Rio de Janeiro in July 2013. According to the Vatican, 1 million people turned out to see the Pope. Hide Caption 39 of 44 Photos: Pope Francis Francis frees a dove in May 2013 during his weekly general audience in St. Peter's Square. Hide Caption 40 of 44 Photos: Pope Francis Francis embraces a young boy with cerebral palsy in March 2013 -- a gesture that many took as a heartwarming token of the Pope's self-stated desire to "be close to the people." Hide Caption 41 of 44 Photos: Pope Francis The Pope washes the feet of juvenile offenders, including Muslim women, as part of Holy Thursday rituals in March 2013. The act commemorates Jesus' washing of the Apostles' feet during the Last Supper. Hide Caption 42 of 44 Photos: Pope Francis Francis stands at the reception desk of the Domus Internationalis Paulus VI residence on March 14, 2013, where he paid the bill for his stay during the conclave that would elect him leader of the world's 1.2 billion Catholics. Hide Caption 43 of 44 Photos: Pope Francis Francis, formerly known as Argentine Cardinal Jorge Mario Bergoglio, was elected the Roman Catholic Church's 266th Pope in March 2013. The first pontiff from Latin America was also the first to take the name Francis. Hide Caption 44 of 44

He is drawing on the fundamental insight of St. Ignatius of Loyola, founder of the Society of Jesus, the Pope's own religious family. With his continual references to the devil, Pope Francis parts ways with the current preaching in the church, which is far too silent about the devil and his insidious ways or reduces him to a mere metaphor.

During the first months of Francis' pontificate in 2013, the Evil One appeared frequently in his messages. In his first major address to the cardinals who elected him, the Argentine pontiff reminded them: "Let us never yield to pessimism, to that bitterness that the devil offers us every day."

In several daily homilies in the chapel of the Vatican guest house, the Pope shared devilish stories with the small congregations rapt in attention as he homilized on taboo topics.

He has offered guidelines on how to rout the demon's strategy: First, it is Jesus who battles the devil.

The second is that "we cannot obtain the victory of Jesus over evil and the devil by halves," for as Christ said in the Gospel of Matthew, "who is not with me is against me, and he who does not gather with me scatters."

The Pope has stressed that we must not be naive: "The demon is shrewd: he is never cast out forever, this will only happen on the last day."

Francis has also issued calls to arms in his homilies: "The devil also exists in the 21st century, and we need to learn from the Gospel how to battle against him," the Pope warned, adding that Christians should not be "naive" about the evil one's ways. The devil is anything but a relic of the past, the pontiff said.

Acknowledging the devil's shrewdness, Francis once preached: "The devil is intelligent, he knows more theology than all the theologians together."

Before a crowd of people on Palm Sunday in 2013, the newly elected Pope even dared to say that when Christians face trials, Jesus is near, but so is "the enemy -- the devil," who "comes, often disguised as an angel and slyly speaks his word to us."

Most recently, on July 12, in the prepared text he was to deliver (in typical fashion he instead gave a masterful, unscripted address to 600,000 young people at a rally in Paraguay), the Pope presented the job description of the devil:

"Friends: the devil is a con artist. He makes promises after promise, but he never delivers. He'll never really do anything he says. He doesn't make good on his promises. He makes you want things which he can't give, whether you get them or not. He makes you put your hopes in things which will never make you happy.

"... He is a con artist because he tells us that we have to abandon our friends, and never to stand by anyone. Everything is based on appearances. He makes you think that your worth depends on how much you possess."

Since the beginning of his papacy, Francis has been warning that whoever wants to follow Jesus must be aware of the reality of the devil. The life of every Christian is a constant battle against evil, just as Jesus during his life had to struggle against the devil and his many temptations.

For Francis, the spirit of evil ultimately does not want our holiness, he does not want our Christian witness, he does not want us to be disciples of Christ.

In all of these references to the devil and his many disguises, Pope Francis wishes to call everyone back to reality. The devil is so frequently active in our lives and in the church, drawing us into negativity, cynicism, despair, meanness of spirit, sadness and nostalgia.

We must react to the devil, Francis says, as did Jesus, who replied with the Word of God. With the prince of this world one cannot dialogue.

Dialogue is necessary among us, it is necessary for peace, it is an attitude that we must have among ourselves in order to hear each other, to understand each other. Dialogue is born from charity, from love.

But with the Dark Prince one cannot dialogue; one can only respond with the Word of God that defends us.

The devil has made a comeback in this pontificate and is playing an important role in Francis' ministry. Francis is dead serious about the devil! And he takes every opportunity he can to tell the devil to get the hell out of our lives and our world.

It's not that Francis has been focusing on the evil one's power, nor has he been mesmerized by the Harry Potter movies or by a desire to do sequels to the "Exorcist" movie: This Pope doesn't watch TV!

All of the temptations Francis speaks about so often are the realistic flip side to the heart of the Argentine Jesuit Pope's message about the world that is charged with the grandeur, mercy, presence and fidelity of God. Those powers are far greater than the devil's antics.