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65 " One of the major problems encountered in time travel is not that of becoming your own father or mother. There is no problem in becoming your own father or mother that a broad-minded and well-adjusted family can't cope with. There is no problem with changing the course of history—the course of history does not change because it all fits together like a jigsaw. All the important changes have happened before the things they were supposed to change and it all sorts itself out in the end.The major problem is simply one of grammar, and the main work to consult in this matter is Dr. Dan Streetmentioner's Time Traveler's Handbook of 1001 Tense Formations. It will tell you, for instance, how to describe something that was about to happen to you in the past before you avoided it by time-jumping forward two days in order to avoid it. The event will be descibed differently according to whether you are talking about it from the standpoint of your own natural time, from a time in the further future, or a time in the further past and is futher complicated by the possibility of conducting conversations while you are actually traveling from one time to another with the intention of becoming your own mother or father.Most readers get as far as the Future Semiconditionally Modified Subinverted Plagal Past Subjunctive Intentional before giving up; and in fact in later aditions of the book all pages beyond this point have been left blank to save on printing costs.The Hitchhiker's Guide to the Galaxy skips lightly over this tangle of academic abstraction, pausing only to note that the term " Future Perfect" has been abandoned since it was discovered not to be. "

73 " Imagination is not, as some poets have thought, simply synonymous with good. It may be either good or evil. As long as art remained primarily mimetic, the evil which imagination could do was limited by nature. Again, as long as it was treated as an amusement, the evil which it could do was limited in scope. But in an age when the connection between imagination and figuration is beginning to be dimly realized, when the fact of the directionally creator relation is beginning to break through into consciousness, both the good and the evil latent in the working of imagination begin to appear unlimited. We have seen in the Romantic movement an instance of the way in which the making of images may react upon the collective representations. It is a fairly rudimentary instance, but even so it has already gone beyond the dreams and responses of a leisured few. The economic and social structure of Switzerland is noticeably affected by its tourist industry, and that is due only in part to increased facilities of travel. It is due not less to the condition that (whatever may be said about their ‘particles’) the mountains which twentieth-century man sees are not the mountains which eighteenth-century man saw.

It may be objected that this is a very small matter, and that it will be a long time before the imagination of man substantially alters those appearances of nature with which his figuration supplies him. But then I am taking the long view. Even so, we need not be too confident. Even if the pace of change remained the same, one who is really sensitive to (for example) the difference between the medieval collective representations and our own will be aware that, without traveling any greater distance than we have come since the fourteenth century, we could very well move forward into a chaotically empty or fantastically hideous world. But the pace of change has not remained the same. It has accelerated and is accelerating.

We should remember this, when appraising the aberrations of the formally representational arts. Of course, in so far as these are due to affectation, they are of no importance. But in so far as they are genuine, they are genuine because the artist has in some way or other experienced the world he represents. And in so far as they are appreciated, they are appreciated by those who are themselves willing to make a move towards seeing the world in that way, and, ultimately therefore, seeing that kind of world. We should remember this, when we see pictures of a dog with six legs emerging from a vegetable marrow or a woman with a motorbicycle substituted for her left breast. "

Owen Barfield

76 " Each religion makes scores of purportedly factual assertions about everything from the creation of the universe to the afterlife. But on what grounds can believers presume to know that these assertions are true? The reasons they give are various, but the ultimate justification for most religious people’s beliefs is a simple one: we believe what we believe because our holy scriptures say so. But how, then, do we know that our holy scriptures are factually accurate? Because the scriptures themselves say so. Theologians specialize in weaving elaborate webs of verbiage to avoid saying anything quite so bluntly, but this gem of circular reasoning really is the epistemological bottom line on which all 'faith' is grounded. In the words of Pope John Paul II: 'By the authority of his absolute transcendence, God who makes himself known is also the source of the credibility of what he reveals.' It goes without saying that this begs the question of whether the texts at issue really were authored or inspired by God, and on what grounds one knows this. 'Faith' is not in fact a rejection of reason, but simply a lazy acceptance of bad reasons. 'Faith' is the pseudo-justification that some people trot out when they want to make claims without the necessary evidence.

But of course we never apply these lax standards of evidence to the claims made in the other fellow’s holy scriptures: when it comes to religions other than one’s own, religious people are as rational as everyone else. Only our own religion, whatever it may be, seems to merit some special dispensation from the general standards of evidence.

And here, it seems to me, is the crux of the conflict between religion and science. Not the religious rejection of specific scientific theories (be it heliocentrism in the 17th century or evolutionary biology today); over time most religions do find some way to make peace with well-established science. Rather, the scientific worldview and the religious worldview come into conflict over a far more fundamental question: namely, what constitutes evidence.

Science relies on publicly reproducible sense experience (that is, experiments and observations) combined with rational reflection on those empirical observations. Religious people acknowledge the validity of that method, but then claim to be in the possession of additional methods for obtaining reliable knowledge of factual matters — methods that go beyond the mere assessment of empirical evidence — such as intuition, revelation, or the reliance on sacred texts. But the trouble is this: What good reason do we have to believe that such methods work, in the sense of steering us systematically (even if not invariably) towards true beliefs rather than towards false ones? At least in the domains where we have been able to test these methods — astronomy, geology and history, for instance — they have not proven terribly reliable. Why should we expect them to work any better when we apply them to problems that are even more difficult, such as the fundamental nature of the universe?

Last but not least, these non-empirical methods suffer from an insuperable logical problem: What should we do when different people’s intuitions or revelations conflict? How can we know which of the many purportedly sacred texts — whose assertions frequently contradict one another — are in fact sacred? "

Alan Sokal