If the Pentateuch be true, religious persecution is a duty. The dungeons of the Inquisition were temples, and the clank of every chain upon the limbs of heresy was music in the ear of God. If the Pentateuch was inspired, every heretic should be destroyed; and every man who advocates a fact inconsistent with the sacred book, should be consumed by sword and flame.In the Old Testament no one is told to reason with a heretic, and not one word is said about relying upon argument, upon education, nor upon intellectual development—nothing except simple brute force. Is there to-day a christian who will say that four thousand years ago, it was the duty of a husband to kill his wife if she differed with him upon the subject of religion? Is there one who will now say that, under such circumstances, the wife ought to have been killed? Why should God be so jealous of the wooden idols of the heathen? Could he not compete with Baal? Was he envious of the success of the Egyptian magicians? Was it not possible for him to make such a convincing display of his power as to silence forever the voice of unbelief? Did this God have to resort to force to make converts? Was he so ignorant of the structure of the human mind as to believe all honest doubt a crime? If he wished to do away with the idolatry of the Canaanites, why did he not appear to them? Why did he not give them the tables of the law? Why did he only make known his will to a few wandering savages in the desert of Sinai? Will some theologian have the kindness to answer these questions? Will some minister, who now believes in religious liberty, and eloquently denounces the intolerance of Catholicism, explain these things; will he tell us why he worships an intolerant God? Is a god who will burn a soul forever in another world, better than a christian who burns the body for a few hours in this? Is there no intellectual liberty in heaven? Do the angels all discuss questions on the same side? Are all the investigators in perdition? Will the penitent thief, winged and crowned, laugh at the honest folks in hell? Will the agony of the damned increase or decrease the happiness of God? Will there be, in the universe, an eternal auto da fe?
Thus, by science I mean, first of all, a worldview giving primacy to reason and observation and a methodology aimed at acquiring accurate knowledge of the natural and social world. This methodology is characterized, above all else, by the critical spirit: namely, the commitment to the incessant testing of assertions through observations and/or experiments — the more stringent the tests, the better — and to revising or discarding those theories that fail the test. One corollary of the critical spirit is fallibilism: namely, the understanding that all our empirical knowledge is tentative, incomplete and open to revision in the light of new evidence or cogent new arguments (though, of course, the most well-established aspects of scientific knowledge are unlikely to be discarded entirely).. . . I stress that my use of the term 'science' is not limited to the natural sciences, but includes investigations aimed at acquiring accurate knowledge of factual matters relating to any aspect of the world by using rational empirical methods analogous to those employed in the natural sciences. (Please note the limitation to questions of fact. I intentionally exclude from my purview questions of ethics, aesthetics, ultimate purpose, and so forth.) Thus, 'science' (as I use the term) is routinely practiced not only by physicists, chemists and biologists, but also by historians, detectives, plumbers and indeed all human beings in (some aspects of) our daily lives. (Of course, the fact that we all practice science from time to time does not mean that we all practice it equally well, or that we practice it equally well in all areas of our lives.)