“ If you hold by anything in the world more than by reason , truth , and justice ; if your will be un certain and vacillating, either in good or evil ; if logic alarm you , or the naked truth make you blush ; if you are hurt when accepted errors are assailed ; condemn this work straight away ; do not read it ; let it cease to exist for you ; but at the same time do not cry it down as dangerous ." ELIPHAS LÉVI .