Christ's call for his disciples to be one requires that even as they try to resolve their differences on doctrinal and moral questions, they must get used to working and praying together, Pope Francis said.

"Increasingly we are learning to ask ourselves: This initiative, can we share it with our brothers and sisters in Christ?" the Pope said on February 6 in a speech to leaders of the Council of the Evangelical Church in Germany, a body representing Lutherans, Reformed and United communities.

"The differences in questions of faith and morals, which still exist, remain challenges on the path toward the visible unity for which our faithful yearn," the Pope said. "The pain is noticed particularly by couples who belong to different confessions."