Few things about life are truly constant. But, there is one thing in particular, which is a constant in not just lives of most human beings, but across the entire life of humanity itself. And, that one thing is change.
Christmas is here. Be thankful. Be present. Give until it hurts. Love the season. Be that idea. You need not limit yourself to any single tradition, to the distinction of any particular religion, nor to the strictures of any outwardly imposed ideal.