It decreed by God that the edict of Caesar should come forth; namely, that his Son should not only be born poor, but the poorest of men, causing him to be born away from his own house, in a cave which was inhabited only by animals. Other poor people, who are born in their own houses, have certainly more comforts in the way of clothes, of fire, and the assistance of persons who lend their aid, even if it is out of compassion. What son of a poor person was ever born in a stable? In a stable only beasts are born.
--St. Alphonsus Liguori, The Incarnation, Birth and Infancy of Jesus Christ