Pope Francis has warned priests and nuns about the dangers of watching pornography online, saying it “weakens the priestly heart.”

The 86 year old pontiff was was responding to a question about how digital and social media should be best used.

During a session at the Vatican with priests, nuns and seminarians, his Holiness said “pornography is a vice that so many people have, even priests and nuns – and added, “the devil enters from there.”

The Pope advised the group to delete pornography from their phones so there will be no temptation.

Church teaching sees pornography as an offence against chastity.