2. Next I come to the implicit assumption of definite propositions in the first start of a course of reasoning, and the arbitrary exclusion of others, of whatever kind. Unless we had the right, when we pleased, of ruling that propositions were irrelevant or absurd, I do not see how we could conduct an argument at all; our way would be simply blocked up by extravagant principles and theories, gratuitous hypotheses, false issues, unsupported statements, and incredible facts. There are those who have treated the history of Abraham as an astronomical record, and have spoken of our Adorable Saviour as the sun in _Aries_. Arabian Mythology has changed Solomon into a mighty wizard. Noah has been considered the patriarch of the Chinese people. The ten tribes have been pronounced still to live in their descendants, the Red Indians; or to be the ancestors of the Goths and Vandals, and thereby of the present European races. Some have conjectured that the Apollos of the Acts of the Apostles was Apollonius Tyaneus. Able men have reasoned out, almost against their will, that Adam was a negro. These propositions, and many others of various kinds, we should think ourselves justified in passing over, if we were engaged in a work on sacred history; and there are others, on the contrary, which we should assume as true by our own right and without notice, and without which we could not set about or carry on our work. (1) However, the right of making assumptions has been disputed; but, when the objections are examined, I think they only go to show that we have no right in argument to make any assumption we please. Thus, in the historical researches which just now came before us, it seems fair to say that no testimony should be received, except such as comes from competent witnesses, while it is not unfair to urge, on the other side, that tradition, though unauthenticated, being (what is called) in possession, has a prescription in its favour, and may, _primâ facie_, or provisionally, be received. Here are the materials of a fair dispute; but there are writers who seem to have gone far beyond this reasonable scepticism, laying down as a general proposition that we have no right in philosophy to make any assumption whatever, and that we ought to begin with a universal doubt. This, however, is of all assumptions the greatest, and to forbid assumptions universally is to forbid this one in particular. Doubt itself is a positive state, and implies a definite habit of mind, and thereby necessarily involves a system of principles and doctrines all its own. Again, if nothing is to be assumed, what is our very method of reasoning but an assumption? and what our nature itself? The very sense of pleasure and pain, which is one of the most intimate portions of ourselves, inevitably translates itself into intellectual assumptions.