Mankind is a great, an immense family. This is proved by what we feel in our hearts at Christmas.

The line frames Christmas not primarily as a doctrinal proposition but as an experiential proof of human solidarity. By calling humanity an “immense family,” it emphasizes kinship that transcends nation, class, and ideology; the “proof” is affective—what people “feel in our hearts” when the season heightens generosity, reconciliation, and concern for the vulnerable. In this reading, Christmas becomes a moral and social revelation: the Incarnation is mirrored in a renewed recognition of shared dignity. The quote also implies that such sentiments are not sentimental excess but evidence of a real underlying unity that ought to shape conduct beyond the holiday.