It may thus be allowable for us, without encroaching on the domain of theology, to inquire to what extent scientific principles and scientific habits of thought agree with or diverge from the religious beliefs of men. I do not propose to enter here into the inquiry as to the accordance of the Bible with the earth's geological history, or that of its representations of nature with the facts as held by science. These subjects I have fully discussed in other works, which are sufficiently accessible.[15] I shall merely refer to certain general relations of science to the probability of a divine revelation, and to the character of such revelation.
As to what is termed natural religion, enough has already been said. If nature testifies to the being of God, and if the reason and the conscience implanted in man, "accusing and excusing" one another, constitute a law of God within him, regulating in some degree his relations to God and to his fellow-men, we have a sufficient basis for the natural religion which more or less actuates the conduct of every human being. The case is different with revealed religion. Here we have an apparent interference on the part of the Creator with his own work, an additional intervention in one department to effect results which elsewhere are worked out by the ordinary operation of natural law. In revelation, therefore, we may have something, quite out of the ordinary course of nature. On the other hand, it is possible that even here we may have something more in harmony with natural laws than at first sight appears.
It cannot truly be said that a revelation from God to man is improbable from the point of view of science. Physical laws and brute instincts are in their nature unvarying, and neither require nor admit of intervention. But the reason and the will of free agents are in this respect different. Though necessarily under law, they can judge and decide between one law and another, and can even evade or counteract one law by employing another, or can resolve to be disobedient. Rational free agents may thus enter into courses not in harmony with their own interests or their relations to their surroundings. Hence, so soon as it pleased God to introduce in any part of the universe a free rational will gifted with certain powers over lower nature, only two courses were possible: either God must leave such free agent wholly to his own devices, making him a god on a small scale, and so far practically abdicating in his favor, or he must place him under some law, and this not of the nature of mere physical compulsion--which, on the hypothesis, would be inadmissible--but in the nature of requirements addressed to his reason and his conscience. Hence we might infer _a priori_ the probability of some sort of communication between God and man. Further, did we find such rational creature beginning, on his introduction into the world, to mar the face of nature, to inflict unnecessary suffering or injury on lower creatures or on members of his own species, to disregard the moral instincts implanted in him, or to disown the God who had created him, we should still more distinctly perceive the need of revelation. This would in such case be no more at variance with science or with natural law than the education given by wise parents to their children, or the laws promulgated by a wise government for the guidance of its subjects, both of which are, and are intended to be, interventions affecting the ordinary course of affairs.