Online pornography viewing poses risks to priests and nuns, according to Pope Francis, who claims that it “weakens the priestly heart.”

At a Vatican meeting, the 86-year-old Pope was asked how social media and digital technology should be used, BBC reports.

He claimed that pornography was “a vice that so many people have — even priests and nuns.”

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“The devil enters from there,” BBC quoted Pope Francis as saying.

He advised priests and seminaries to use social media and other aspects of the digital world, but to not spend too much time there.

He declared: “The pure heart, the one that Jesus receives every day, cannot receive this pornographic information.”

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“Delete this from your phone, so you will not have temptation in hand,” he urged the group.

According to church doctrine, pornography violates chastity.