The path to Christian unity, the oneness that Jesus prayed his disciples would have, begins with humbly recognizing that "the blessings we have received are not ours by right, but have come to us as a gift; they were given to be shared with others," he said.
https://www.ncronline.org/news/quick-reads/pope-says-its-grave-sin-deny-god-has-blessed-other-christians
Source: National Catholic Reporter