The Catholic Church claims, not only to judge infallibly on religious questions, but to animadvert on opinions in secular matters which bear upon religion, on matters of philosophy, of science, of literature, of history, and it demands our submission to her claim. It claims to censure books, to silence authors, and to forbid discussions. In all this it does not so much speak doctrinally, as enforce measures of discipline. It must of course be obeyed without a word, and perhaps in process of time it will tacitly recede from its own injunctions. In such cases the question of faith does not come in; for what is matter of faith is true for all times, and never can be unsaid.