Let us illustrate it briefly. We do not, of course, mean to say, that _if_ it were true that all the leading naturalists were infidels, the inference would necessarily follow that Christianity is untenable, and incompatible with science. Not at all. First of all, natural scientists who oppose Christianity could hardly ever come forward in the capacity of experts in this matter. For by venturing the assertion that world-matter and world-force are eternal and uncreated, that they develop by force of natural causality, by unending evolution, and not by the power and direction of an intelligent cause, they leave their own province and trespass on the domain of philosophy. These and similar questions are not solved by natural science research, by experiment, observation, or calculation, but are the subjects of philosophical speculation. Atheism, materialism, the denial of the soul’s immortality or of eternal destination, all these are philosophical matters, and a natural science theory of the world is a misconception about as absurd as a Swiss England or a Bavarian Spain. As it is impossible to review here all scientists of the past centuries, to probe their bent of mind, we shall restrict ourselves in the following to scientists of the first rank, for to them the assertion above mentioned must chiefly refer. First of all, they were possessed of that spirit of scientific research claimed to be incompatible with the faith; and they, more than others, should have been conscious of this contradiction. It is plain that if they did not know anything of the claimed antagonism between the theories of evolution and of creation, between physical facts and spirituality of soul, between natural law and miracles; if it be shown that many of them were actually orthodox Christians, believing in the supernatural and yet enthusiastic friends of science, fathoming the laws of nature and yet unshaken in their faith, then the fact that inferior minds talk of a contradiction unknown to these great ones can no longer make much of an impression. Therefore let us look over the long list of great scholars of the last centuries, those great men to whom we owe knowledge and discoveries that are our joy to this very day. Among them we shall find many who, in their life and thought, have plainly confessed themselves faithful Christians; we shall find that others were at least the opponents of atheism and materialism, that they clung to the fundamental truths of the Christian faith, and that is a matter of moment when the antagonism between natural science and faith is under discussion. We shall not go back to the ancient representatives of natural science, men like _Pythagoras_, _Aristotle_, _Archimedes_, _Albert the Great_, _Roger Bacon_, and others of past ages, partly because there is no doubt about the religious views of those men, partly because research at their time was imperfect. We begin at the rise of modern natural science. The Old Masters.