Again, let us suppose, for argument’s sake, that ethnologists, philologists, anatomists, and antiquarians agreed together in separate demonstrations that there were half a dozen races of men, and that they were all descended from gorillas, or chimpanzees, or ourang-outangs, or baboons; moreover, that Adam was an historical personage, with a well-ascertained dwelling-place, surroundings and date, in a comparatively modern world. On the other hand, let me believe that the Word of God Himself distinctly declares that there were no men before Adam, that he was immediately made out of the slime of the earth, and that he is the first father of all men that are or ever have been. Here is a contradiction of statements more direct than in the former instance; the two cannot stand together; one or other of them is untrue. But whatever means I might be led to take, for making, if possible, the antagonism tolerable, I conceive I should never give up my certitude in that truth which on sufficient grounds I determined to come from heaven. If I so believed, I should not pretend to argue, or to defend myself to others; I should be patient; I should look for better days; but I should still believe. If, indeed, I had hitherto only half believed, if I believed with an assent short of certitude, or with an acquiescence short of assent, or hastily or on light grounds, then the case would be altered; but if, after full consideration, and availing myself of my best lights, I did think that beyond all question God spoke as I thought He did, philosophers and experimentalists might take their course for me,—I should consider that they and I thought and reasoned in different mediums, and that my certitude was as little in collision with them or damaged by them, as if they attempted to counteract in some great matter chemical action by the force of gravity, or to weigh magnetic influence against capillary attraction. Of course, I am putting an impossible case, for philosophical discoveries cannot really contradict divine revelation. So much on the indefectibility of certitude; as to the question whether any other assent is indefectible besides it, I think prejudice may be such; but it cannot be confused with certitude, for the one is an assent previous to rational grounds, and the other an assent given expressly after careful examination. It seems then that on the whole there are three conditions of certitude: that it follows on investigation and proof, that it is accompanied by a specific sense of intellectual satisfaction and repose, and that it is irreversible. If the assent is made without rational grounds, it is a rash judgment, a fancy, or a prejudice; if without the sense of finality, it is scarcely more than an inference; if without permanence, it is a mere conviction. Chapter VIII. Inference. § 1. Formal Inference.