Shalom. It means “peace” in Hebrew.
The message that we put on our Christmas cards is that one simple word: shalom.
Peace is what we desire for all who receive our Christmas cards and it is what I desire for all of you.
That is all. I simply wanted to speak a word of peace (literally).
I leave you a bit more personally, though.
שָׁלוֹם עֲלֵיכֶם (shalom aleichem, peace to you)