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But it is interesting that the same thing happens to you when you have to give some warrant for trusting in "reason". I noted your citation of LaPlace in your book and am glad you brought him up here. LaPlace believed he was not in need of the God hypothesis, just like you, but you should also know he held this position as a firmbeliever in celestial and terrestrial mechanics. He was a causal determinist, meaning that he believed that every element of the universe in the present was "the effect of its past and the cause of its future."

If one kept (as rock-bottom reality) the universe of the senses, aided by instruments and co-ordinated so as to form "science," then one would have to go much further — as many have since gone — and adopt a Behavioristic theory of logic, ethics, and aesthetics. But such a theory was, and is, unbelievable to me. I am using the word "unbelievable," which many use to mean "improbable" or even "undesirable," in a quite literal sense. I mean that the act of believing what the behaviorist believes is one that my mind simply will not perform. I cannot force my thought into that shape any more than I can scratch my ear with my big toe or pour wine out of a bottle into the cavity at the base of that same bottle. It is as final as a physical impossibility.

How is it possible that creatures like ourselves, supplied with the contingent capacities of a biological species whose very existence appears to be radically accidental, should have access to universally valid methods of objective thought? It is because this question seems unanswerable that sophisticated forms of subjectivism keep appearing in the philosophical literature...

But it is not the minds of heretics that are deteriorated most, by the ban placed on all inquiry which does not end in the orthodox conclusions. The greatest harm done is to those who are not heretics, and whose whole mental development is cramped, and their reason cowed, by the fear of heresy. Who can compute what the world loses in the multitude of promising intellects combined with timid characters, who dare not follow out any bold, vigorous, independent train of thought, lest it should land them in something which would admit of being considered irreligious or immoral? Among them we may occasionally see some man of deep conscientiousness, and subtile and refined understanding, who spends a life in sophisticating with an intellect which he cannot silence, and exhausts the resources of ingenuity in attempting to reconcile the promptings of his conscience and reason with orthodoxy, which yet he does not, perhaps, to the end succeed in doing. No one can be a great thinker who does not recognize, that as a thinker it is his first duty to follow his intellect to whatever conclusions it may lead. Truth gains more even by the errors of one who, with due study and preparation, thinks for himself, than by the true opinions of those who only hold them because they do not suffer themselves to think.

We can never be sure that the opinion we are endeavoring to stifle is a false opinion; and if we were sure, stifling it would be an evil still. First: the opinion which it is attempted to suppress by authority may possibly be true. Those who desire to suppress it, of course deny its truth; but they are not infallible. They have no authority to decide the question for all mankind, and exclude every other person from the means of judging. To refuse a hearing to an opinion, because they are sure that it is false, is to assume that their certainty is the same thing as absolute certainty. All silencing of discussion is an assumption of infallibility...

Regarded merely as mental states, there is an enormous difference in the attitude of a man who is engaged in demonstrating a problem of Euclid, and of the same man offering up prayer for the life of a beloved child. The contrast is not merely between the intellectual object gained and the emotional object sought for, but extends itself more particularly to the subjective mood involved in either case. On the one hand there is a consciousness of certitude, on the other hand a painful feeling of incertitude. Nor is this difference between intellection and emotion greatly modified even when both become equal states of certitude. The conviction, e.g. of a geometrical truth, is of a totally different kind from the emotional assurance which the father feels when he knows that the fever crisis is past, and that in all human probability his child will be spared to him. Now it is the characteristic of most religious beliefs that they professedly belong to the regions both of feeling and intellectual conviction. First imparted by authority parental or otherwise, they are confirmed by long association, and are protected and enhanced by the various sacred and subtle influences that invest all religious beliefs. With this peculiar prestige they take their places among the numberless unanalyzed concepts and opinions that form the general stock of human convictions. Ordinarily they never advance beyond this elementary stage, at least in reality, though in many cases the emotional basis of religious beliefs may be supplemented by a superficial intellection which is hardly more than a predetermination to support foregone conclusions. But in all cases of genuine mental growth there is a progress from the stage of unverified emotion to that of critical ratiocination. Religious beliefs, in common with other contents of the mind, are subjected to a rigid scrutiny. The thinker feels compelled as a matter of intellectual honesty to give a reason for the hope that is in him. If tenets so treated are capable of sustaining the criticism directed to them, they reach their culminating stage of conviction. Frequently, however the contrary takes place — beliefs received into the mind recklessly or on insufficient authority are found on investigation to be unworthy of that position; but nevertheless, possessing from long association a strong hold on the affections, they continue to maintain their place as tenets or persuasions of the emotions. We must not, however, suppose that such a transfer is made readily or easily. Every noteworthy record of mental progress proves how difficult it is to undermine, not to say eliminate, beliefs once fully accepted by the feelings.