I wish to speak, remember, not on natural religion, but on natural theology. By the first, I understand what can be learned from the physical universe of man's duty to God and to his neighbour; by the latter, I understand what can be learned concerning God Himself. Of natural religion I shall say nothing. I do not even affirm that a natural religion is possible: but I do very earnestly believe that a natural theology is possible; and I earnestly believe also that it is most important that natural theology should, in every age, keep pace with doctrinal or ecclesiastical theology. Bishop Butler certainly held this belief. His "Analogy of Religion, Natural and Revealed, to the Constitution and Course of Nature"--a book for which I entertain the most profound respect--is based on a belief that the God of Nature and the God of Grace are one; and that, therefore, the God who satisfies our conscience ought more or less to satisfy our reason also. To teach that was Butler's mission, and he fulfilled it well. But it is a mission which has to be re-filled again and again, as human thought changes and human science develops; for if in any age or country the God who seems to be revealed by Nature seems different from the God who is revealed by the then popular religion, then that God, and the religion which tells of that God, will gradually cease to be believed in. For the demands of Reason (as none knew better than good Bishop Butler) must be and ought to be satisfied. And when a popular war arises between the reason of a generation and its theology, it behoves the ministers of religion to inquire, with all humility and godly fear, on which side lies the fault: whether the theology which they expound is all that it should be, or whether the reason of those who impugn it is all that it should be.