Just as Abraham. in pure and strong faith, laughed for joy, so too, Mary and Joseph marveled, not from unbelief but with mighty faith and uncommon understanding. That is the unique nature of faith, that the firmer one believes, the more one marvels and the happier one is. In contrast, when faith is absent, there is neither joy nor enthusiasm.
Martin Luther from a sermon preached on the first Sunday after Christmas in 1531from Jeff Haavisto, King of Grace Church