Some things are Universal. Egyptians, Roman, Greeks, Mayans, Aztecs, Anasazi - - - - Everyone has made an emotional linkage between the returning/lengthening of days in the winter solstice, and the assurance of new life - EVERYBODY. Take a moment to look at the enormous effort to carve out Chaco Canyon.
There are just some Hard-wired Human-Nature Universals:
1) Blood and Sacrifice secure blessings - universal. Look at the phenomenal Mayan-king ritual requirements.
2) Death/crossing the river/sunset - universal poetry from the Egyptians to the moderns.
3) New life/Sunrise/New Birth - universal pictures from Easter Eggs through Roman holidays through the basic building blocks in all of us.
When God sets his sights on a target, He hits the target! He built the heart and connects to it in His greatest Act: incarnation
When we set out to preach the Incarnation and Advent, we tap into a whole reservoir of poetry and imagination, pictures and remembrances, in which 20 minutes of preaching may contact hours worth of imaginings within the mind of the hearer. When we celebrate Christmas and solstice together, we've linked powerful, mind-changing concepts.
My devotional readings begin early, re-visiting the incarnation passages, and the theologians who celebrate incarnation, from the Philippians hymn to the moderns.