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Title: How it happens that men believe so many liars, who say that they have seen miracles, and do not believe any of those who say that they have secrets to make men immortal, or restore youth to them.—Having considered how it happens that so great credence is given to so many impostors, who say they have remedies, often to the length of men putting their lives into their hands, it has appeared to me that the true cause is that there are true remedies. For it would not be possible that there should be so many false remedies, and that so much faith should be placed in them, if there were none true. If there had never been any remedy for any ill, and all ills had been incurable, it is impossible that men should have imagined that they could give remedies, and still more impossible that so many others should have believed those who boasted of having remedies; in the same way as did a man boast of preventing death, no one would believe him, because there is no example of this. But as there were a number of remedies found to be true by the very knowledge of the greatest men, the belief of men is thereby induced; and, this being known to be possible, it has been therefore concluded that it was. For people commonly reason thus: "A thing is possible, therefore it is"; because the thing cannot be denied generally, since there are particular effects which are true, the people, who cannot distinguish which among these particular effects are true, believe them all. In the same way, the reason why so many false effects are credited to the moon, is that there are some true, as the tide.

It is the same with prophecies, miracles, divination by dreams, sorceries, &amp;c. For if there had been nothing true in all this, men would have believed nothing of them; and thus, instead of concluding that there are no true miracles because there are so many false, we must, on the contrary, say that there certainly are true miracles, since there are false, and that there are false miracles only because some are true. We must reason in the same way about religion; for it would not be possible that men should have imagined so many false religions, if there had not been a true one. The