There are others who believe not in the existence of devils or fallen angels. That is not so bad; but yet they must remember that their refusal to believe in devils does not prove that there are none. The greatest enemies of science are those who blindly maintain false statements and false principles of knowledge. Let us look for the truth in every investigation. Even Huxley, in the midst of his attacks on dogmatic religion, protests also against dogmatic infidelity. Science, he says, is as little atheistic as it is materialistic. All this must be remembered chiefly when we undertake to explore, as we are now doing, the unknown region which we have called the border-land of science. There we find many strange phenomena, and we are trying to discover their true nature and true causes. If we can explain some of them by natural causes, as by the powers of the imagination when it is in an abnormal or hypnotic state, very well, let us explain them. But let us not rashly conclude that all other phenomena can be thus explained. Do not reason this way, as some writers have done: "Some effects," they say, "were formerly attributed to witchcraft or deviltry and can now be explained by hypnotism. Therefore all other mysterious effects can also be thus explained. Therefore there is not and never was such a thing as witchcraft or deviltry. So, too, some events often reputed miraculous can be explained by natural causes, therefore no miracle has ever happened." That is the reasoning of rash and ignorant men, and not of scientific minds. It does not follow from the fact that God usually works by natural causes, that He cannot on special occasions and for very important reasons show His hand, as it were, and act so manifestly against the course of nature as to show us that it is He who is at work and He wants us to mind Him. History furnishes many instances of this kind. IX. CREDENTIALS OF CHRIST.