The true field and subject of imposture are things unknown, forasmuch as, in the first place, their very strangeness lends them credit, and moreover, by not being subjected to our ordinary reasons, they deprive us of the means to question and dispute them: For which reason, says Plato, --[In Critias.]--it is much more easy to satisfy the hearers, when speaking of the nature of the gods than of the nature of men, because the ignorance of the auditory affords a fair and large career and all manner of liberty in the handling of abstruse things. Thence it comes to pass, that nothing is so firmly believed, as what we least know; nor any people so confident, as those who entertain us with fables, such as your alchemists, judicial astrologers, fortune-tellers, and physicians,