CUT TO THE CHASE

you cannot evaluate an insane belief system from within it.
Its range precludes this.  You can only go beyond it, look
back from a point where sanitgy exists and see the contrast.

Only by this contrast can insanity be judged as insane. . .

Lack of knowledge of any kind is always associated with
unwillingness to know, and this produces a total lack of
knowledge simply  because knowledge is total . . . The Holy
Spirit judges against the reality of the ego's thought system
merely because He knows its foundation is not true.  Therefore,
nothing that arises from it means anything.  He judges every
belief you hold in terms of where it comes from.  If it comes from
God, He knows it to be true.  If it does not, He knows that it is meaningless.