Pope Francis has written a letter to Catholics condemning sexual abuse by priests. >> On WPXI.com: Report names 300 alleged ‘predator priests’ >> Read more trending news “Looking back to the past, no effort to beg pardon and to seek to repair the harm done will ever be sufficient,” said the letter, which the Vatican released Monday. “Looking ahead to the future, no effort must be spared to create a culture able to prevent such situations from happening, but also to prevent the possibility of their being covered up and perpetuated.” >> On WPXI.com: Report: Ring of 'predatory priests' shared, photographed victims He added: “We showed no care for the little ones; we abandoned them.” >> Read the full letter here The letter came less than a week after a grand jury report identified more than 300 priests accused of abuse in six dioceses in Pennsylvania. According to WPXI, a ring of predatory priests with the Pittsburgh Diocese allegedly shared information on victims and exchanged the victims among themselves, as well as made child pornography on Diocesan property. >> On WPXI.com: Cardinal Wuerl moves monthly meeting with council of priests In his letter, Pope Francis said Catholics must “acknowledge and condemn, with sorrow and shame, the atrocities perpetrated by consecrated persons, clerics, and all those entrusted with the mission of watching over and caring for those most vulnerable.” He wrote: “Let us beg forgiveness for our own sins and the sins of others. An awareness of sin helps us to acknowledge the errors, the crimes and the wounds caused in the past and allows us, in the present, to be more open and committed along a journey of renewed conversion.” Read more here.