A total of 96 pages, the book offers a nutshell overview of how Benedict XVI fought against scourges in the Church and in society such as the growing presence of relativism, the economic crisis, pedophilia, increasing global hostility toward Christians and the first "Vatileaks" scandal.
It also highlights Benedict XVI's many efforts in favor of ecumenical dialogue, particularly with the Orthodox and Anglican Churches, as well as his emphasis on caring for the environment and promoting sustainable development and business practices.
Mancini also notes that Benedict was the one to start the current process of reform and "cleaning" within the Roman Curia, which Pope Francis has continued, particularly on financial matters, the streamlining of the marriage annulment process and dialogue with the Muslim community.
"Financial transparency and pedophilia are the two pillars of the process of reform that Benedict set up in the Church. He started," Mancini said.
"(And) fortunately his successor has carried this process of reform forward," he added, noting that while on his way back from Africa in November, Pope Francis himself said that Benedict is the one who started the reform.
On the papal plane from Bangui to Rome Nov. 30, 2015, Francis took a question from a journalist on corruption in the Vatican. In his response, the Pope noted how on Good Friday in 2005, 13 days before St. John Paul II died, the then-Cardinal Ratzinger had spoken about "the filth in the Church."
"He denounced it first," Francis said, noting that Ratzinger spoke about the same thing again shortly before the conclave, "and we elected him for that freedom in saying things."
In his comments to CNA, Mancini noted that while Benedict did a lot in terms of beginning the current process of reform, it wasn't all smooth sailing – he also faced resistance, as Francis does today.
"When there is an idea of reform, whatever it is, there is always resistance. Pope Benedict faced a lot of resistance and a lot of problems," Mancini said.
One of the toughest things Benedict had to face immediately after his election was a Curia that Mancini described as "too independent" due to John Paul II's declining health in the last years of his papacy.
"The problem, according to me, is that toward the end of the pontificate of John Paul II – he was an extraordinary Pope, absolutely extraordinary – the problem is that his physical limitations allowed him to govern very little."
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What resulted is that when Benedict XVI arrived, he had to put things back into order, so "the work of reform and order began right away."
In addition to Benedict's efforts in creating financial transparency and accountability in abuse cases, he was also the one who first instituted a commission to study the streamlining of the marriage annulment process.
The commission finished its work and handed it in, but since Benedict resigned, he never made a move on it. Francis himself picked the project back up, forming a new commission to get an updated study of the issue, which resulted in the new process that went into place Dec. 10.
In terms of the resistance Benedict faced, Mancini said he believes it is the same "lobby" that is resisting Francis' process of reform.
"I think there is a lot of continuity between the two, whether it's among whoever tries to hinder the process of reform, or the way of reforming the Church," he said, because Pope Francis "is continuing the same work that Pope Benedict started."
"So I realize in speaking with many people, there's a need to thank Benedict more for what he did for the Catholic Church."