But when we turn from the objective to the subjective side of knowledge, we are met with a second objection. The doctrine that the Divine Logos co-operates with the human reason, is supposed to be inconsistent with the undoubted fact that many earnest and successful thinkers have been if not atheistic, at least agnostic; unable, that is, to attain to the very knowledge to which, as it would seem on the Christian hypothesis, all intellectual effort should inevitably lead. But this difficulty is only superficial. When we say that the Divine reason assists, we do not mean that it supersedes the human. An initiative still lies with man; and he must choose of his own accord the particular field of his intellectual pursuit. When he has chosen his line of study, and followed it with the requisite devotion, he will arrive at the kind of truth to which that particular study leads, the physicist at laws of nature, the philosopher at laws of thought, the artist at ideal beauty, the moralist at ethical truth: and in each case, as we believe, by Divine assistance, his discoveries being in fact revelations. But the method, the education, the experience involved in different studies are so distinct, that few in a lifetime can reach the eminence that teaches with authority, or even the intelligence that thoroughly appreciates, more than one department of the complex world of thought. And if a man wanders from his own province into unfamiliar regions, he naturally meets with failure in proportion to his hardihood. In the case of the special sciences this is universally recognised. No astronomer would think of dogmatizing on a question of geology, nor a biologist on the details of chemistry or physics. But when it is a question between science and philosophy, the rule is often forgotten; and the spectacle of scientific specialists blundering about in metaphysics is painfully common in the present day: while strange to say, in the case of theology this forgetfulness reaches a climax, and men claim casually to have an opinion upon transcendent mysteries, without any of the preparation which they would be the first to declare needful for success in the smallest subsection of any one of the branches of science.