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But the ordinary rules cannot be worked until we have decided whether miracles are possible, and if so, how probable they are. For if they are impossible, then no amount of historical evidence will convince us. If they are possible but immensely improbable, then only mathematically demonstrative evidence will convince us:
But if Naturalism is true, then we do know in advance that miracles are impossible: nothing can come into Nature from the outside because there is nothing outside to come in, Nature being everything. No doubt, events which we in our ignorance should mistake for miracles might occur: but they would in reality be (just like the commonest events) an inevitable result of the character of the whole system.
The unthinking person might stop here and say 'Faith!' You see, there is nothing beyond Naturalism that gave be arrived at by reason. Of course, Lewis has set out to take the reader much further than that simplistic, willfully narrow conclusion.
Unless our conclusion is the logical consequent from a ground it will be worthless and could be true only by a fluke. Unless it is the effect of a cause, it cannot occur at all. It looks therefore, as if, in order for a train of thought to have any value, these two systems of connection must apply simultaneously to the same series of mental acts.
Why is this not also true of everything else? Does everything that exists require both a ground-consequent AND a cause-effect?
‘But’, it will be said, ‘it is incontestable that we do in fact reach truths by inferences’. Certainly. The Naturalist and I both admit this. We could not discuss anything unless we did. The difference I am submitting is that he gives, and I do not, a history of the evolution of reason which is inconsistent with the claims that he and I both have to make for inference as we actually practise it. For his history is, and from the nature of the case can only be, an account, in Cause and Effect terms, of how people came to think the way they do. And this of course leaves in the air the quite
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If the value of our reasoning is in doubt, you cannot try to establish it by reasoning. If, as I said above, a proof that there are no proofs is nonsensical, so is a proof that there are proofs.
Bacon warned us long ago that ‘the human understanding is of its own nature prone to suppose the existence of more order and regularity in the world than it finds. And though there be many things which are singular and unmatched, yet it devises for them parallels and conjugates and relatives which do not exist. Hence the fiction that all celestial bodies move in perfect circles’ (Novum Organum, I, 45).
Lewis is tough for me sometimes. But, if I can't get it from his simple, straightforward way, I'm not likely to get it at all.
It is only when you are asked to believe in Reason coming from non-reason that you must cry Halt, for, if you don’t, all thought is discredited. It is therefore obvious that sooner or later you must admit a Reason which exists absolutely on its own. The problem is whether you or I can be such a self-existent Reason.
St Jerome
Some people think that when we make them we are not using our Reason, but are employing some different power. Other people think that we make them by our Reason. I myself hold this second view. That is, I believe that the primary moral principles on which all others depend are rationally perceived.
I now turn to another possible misgiving. To some people the great trouble about any argument for the Supernatural is simply the fact that argument should be needed at all. If so stupendous a thing exists, ought it not to be obvious as the sun in the sky? Is it not intolerable, and indeed incredible, that knowledge of the most basic of all Facts should be accessible only by wire-drawn reasonings for which the vast majority of men have neither leisure nor capacity? I have great sympathy with this point of view. But we must notice two things.
Lewis is always to the point on the points he considers most controversial and hardest to contemplate.

