The Christmas Star in the night sky, the shining of the Christmas light in the night – all this is the sign that light breaks into the darkness. Though we see about us the darkness of unrest, of family discord, of class struggle, of competitive jealousy and of national hatred, the light shall shine and drive it out.…The eternal light shall come to earth and give it a new radiance; it shines into the midst of night and makes us children of the light. Only those who are reborn as children shall become children of the light. Wherever the Christmas Child is born in a heart, wherever Jesus begins his earthly life anew – that is where the life of God’s love and of God’s peace dawns again.

Source: Watch for the Light

Even the apostles felt they were living in darkness.