Christians in Europe must break down "walls of fear and aggression" and try to understand people of other faiths and backgrounds, Pope Francis has said.

In a video message on Saturday to participants at the "Together for Europe" gathering in Munich, the Pope insisted that "invisible walls" are being strengthened and dividing people from one another.

"These walls are being built in people's hearts," the Pope said. "They are walls made of fear and aggression, a failure to understand people of different backgrounds or faith. They are walls of political and economic selfishness, without respect for the life and dignity of every person."