Time travel may be achieved one day, or it may not. But if it is, it should not require any fundamental change in world-view, at least for those who broadly share the world view I am presenting in this book.
David DeutschIt is possible to build a virtual-reality generator whose repertoire includes every possible environment.
David DeutschThe overwhelming majority of theories are rejected because they contain bad explanations, not because they fail experimental tests.
David DeutschTo me quantum computation is a new and deeper and better way to understand the laws of physics, and hence understanding physical reality as a whole.
David DeutschIf you reject the infinite, you are stuck with the finite, and the finite is parochial... the best explanation of anything eventually involves universality, and therefore infinity. The reach of explanations cannot be limited by fiat.
David DeutschLike every other destruction of optimism, whether in a whole civilisation or in a single individual, these must have been unspeakable catastrophes for those who had dared to expect progress. But we should feel more than sympathy for those people. We should take it personally. For if any of those earlier experiments in optimism had succeeded, our species would be exploring the stars by now, and you and I would be immortal.
David Deutsch