On this deep dive episode of “Inside the Vatican,” we examine the lessons from Benedict XVI's post-papacy—and what needs to change to protect future popes who retire.

Although Benedict expresses regret that abuse happened on his watch, he does not take responsibility for any specific cases, and his lawyers maintain his innocence.

Pope Francis will visit Malta from April 2-3, a Vatican spokesman said. More than 90 percent of the country’s 460,000 people profess to be Catholic.

In the letter, Pope Francis “speaks as a shepherd, as a brother” and “expressed once again his complete trust, his full support and also his prayers,” said the secretary, Archbishop Georg Gänswein.

“Each individual case of sexual abuse is appalling and irreparable,” Pope Benedict wrote. “The victims of sexual abuse have my deepest sympathy, and I feel great sorrow for each individual case.”