Appraisals of the pontificate of Pope Pius XII have pictured him as a democratic-minded person who did his best to modernize a tradition-bound, authoritarian-minded institution with not completely satisfactory results. In the words of one author, “Pacelli, a modern man set down in a dank maze of dusty dogma, musty custom, dark superstition, and moss-grown standpattism, may very well have done all that one man can do to let in light and air.” Comments of this type are, obviously, mixed compliments, the laudatory references to the late pope and his personal achievements being counterbalanced by less favorable epithets for the Church. It is not the purpose of this article to consider the alleged stand-pattism, dustiness, mustiness, or totalitarian-mindedness of the Church. Its object is to present a study of some of the political teaching of Pius XII, and to inquire whether any of his doctrines are of a modernizing nature and to what extent they “let in light and air.”