via the Vatican:

What is the universal message of Christmas? It is that God is a good Father and we are all brothers and sisters.

This truth is the basis of the Christian vision of humanity. Without the fraternity that Jesus Christ has bestowed on us, our efforts for a more just world fall short, and even our best plans and projects risk being soulless and empty.

For this reason, my wish for a happy Christmas is a wish for fraternity.

Fraternity among individuals of every nation and culture.

Fraternity among people with different ideas, yet capable of respecting and listening to one another.

Fraternity among persons of different religions. Jesus came to reveal the face of God to all those who seek him….

The experience of families teaches us this: as brothers and sisters, we are all different from each other. We do not always agree, but there is an unbreakable bond uniting us, and the love of our parents helps us to love one another. The same is true for the larger human family, but here, God is our “parent”, the foundation and strength of our fraternity.